6．甲是一种能生活在多种土壤中的小型昆虫，常被昆虫乙大量捕食，DDT和aldrin是用于控制这些生物的杀虫剂，aldrin对甲和乙毒性相同，但DDT对乙的毒性比对甲更强，现用DDT和aldrin单独处理田块，如图所示中的哪两个图能分别代表DDT和aldrin单独作用时对昆虫数量的影响(　　 )

A．2和1　　 　　　 B．1和3 　　 C．2和4　　 　　　 D．3和4

5．老鼠的皮毛黄色(A)对灰色(a)为显性。有一位遗传学家，在实验中发现含显性基因(A)的精子和显性基因(A)的卵细胞不能结合。如果杂合的黄鼠与黄鼠(第一代)交配得到第二代，后代(第二代)相同基因型老鼠继续交配一次得到第三代，那么在第三代中黄鼠的比例为(假定每对老鼠产生的后代数量相同)　

　 A．40%　　　　　　 B．44.4%　　　　　 C．66.7%　　　　　 D．75%

4．下图1表示细胞分裂的不同时期与每条染色体DNA含量变化的关系；图2表示处于细胞分裂不同时期的细胞图象。分析两图，相关的叙述中，都不正确的选项组合是D

①图1中AB段形成的原因是DNA复制，该过程发生在细胞分裂间期

②图1中CD段形成的原因是着丝点分裂

③图2中甲和乙细胞处于图1中的BC段，图2中丙细胞处于图1的DE段

④图2的甲细胞中染色体数与DNA分子数之比为1∶2

⑤就图2乙分析可知，该细胞含有8条染色单体

⑥图2丙细胞如果是乙细胞的子细胞，那么丙细胞就是次级卵母细胞

A．①②⑤　　　　　　 　　　 B．①④⑥　　　　　　　　　 C．②⑤⑥　　　　　　　　　 D．③④⑥

[答案]D

[解析]图1中纵坐标为每条染色体DNA含量变化，其中AB段表示有丝分裂间期或第一间期，BC段表示有丝分裂前中期或减数第一次分裂和减数第二次分裂的前中时期，DE段表示丝分裂后末期及减数减数第二次分裂的后末期。图2的甲表示有丝分裂后期处于图1的DE段，乙图表示减数第一次分裂后期，处于图1的BC段，图2中丙细胞为减数第二次分裂中期，处于图1的BC段。图2的甲细胞中染色体数与DNA分子数之比为1∶1，图2丙细胞如果是乙细胞的子细胞，那么丙细胞是次级卵母细胞或第一极体。

3．位于人体内的神经元的功能分段，以下面模式图表示。下列据图分析的叙述中，正确的是(　　 )

A．突触一般不含有 I 部位的结构

B．一旦Ⅱ部位发生冲动，传导到Ⅳ 部位，就能引发Ⅳ释放兴奋性神经递质

C．III部位传导兴奋时，兴奋部位膜内外电流方向相反

D．神经元的细胞核一般存在于Ⅳ部位

2．右图所示种群在理想环境中呈“J”型增长，在有环境阻力条件下呈“S”型增长。下列有关种群数量增长曲线及其应用的叙述中正确的是(　 )　

A.种群“S”型增长过程中，增长率逐渐增大

B.渔业捕捞后应该控制剩余量在b点

C.种群增长过程中出现环境阻力是在d点之后

D.建立自然保护区，提高K值是保护大熊猫的根本措施

[答案]D

[解析]种群“S”型增长过程中，增长率先逐渐增大后下降；种群增长过程中出现环境阻力是在c点之后；渔业捕捞后需控制剩余量在K/2，即c点。

1．血清蛋白电泳后得到血清白蛋白和三种球蛋白(右图)，据图分析，抗体应属于(　　 )

A．血清白蛋白

B．α球蛋白

C．β球蛋白

D．γ球蛋白

3. 文体的选择：文章的选择以说明、议论、夹叙夹议等为主，单纯以时间或事件为线索的记叙文不宜于考察逻辑思维能力，出现机率不大。

[练习]

(1)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

_71_ One of the best things you can possibly do is to start you own club. It’s great fun especially if you are the sort of person who feels there’s never anything to do during the school holidays.

The first thing you need to come up with is an idea for your club. _72_ Pets, clothes, pop music or dancing groups, sports, making things? The list is endless.

Next you need some friends to be in your club with you. _73_ All you need is three or four other people who are interested in the same thing as you.

_74 You should all sit down somewhere together with lots of pieces of paper and write down every name you can think up. That’ll keep you busy for ages.

At your first meeting you should make up a rule book. And the first rule should be no grown-ups or little/big brothers or sisters! The best clubs are always secret!

Now you have just about everything you need, except membership cards. These are very important and again you can speed a lot of time making them. 75 Why not leave some space for a photo of yourself? That will make the membership card really look like it.

So there you are, get clubbing! Once you get started you’ll think of loads of more interesting things to do!

A. That’s easy.

B. Enjoy your own club!

C. Invite a designer to join you.

D. What are you interest in?

E. Some vacation is just around the corner.

F. Then you need to pick a name for your club.

G. Use a bright thick pen to make a special design.

(2)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中的两项为多途选项。

Are you truly happy? Do you ever know what it means to be happy and what it takes to achieve happiness? __71___. The following are a few tips that I follow to create happiness in my life.

※ Make a plan for attaining goals that you believe will make you happy. Your moods will very likely increase if you are going after something you value.

※Surround yourself with happy people. It is easy to begin to think negatively when you are surrounded by people who think that way. ___72___.

※When something goes wrong, try to figure out a solution instead of being absorbed in self pity. Truly happy people don’t allow setbacks to affect their mood because they know that with a little thought they can turn the circumstances back to their favor.

※__73_. These few minutes will give you the opportunity to focus on the positive things in your life and will lead you to continuous happiness.

※　 74 　. Whether you treat yourself to lunch, take a long, relaxing bath or simply spend a few extra minutes on your appearance, you will be subconsciously (下意识地) putting yourself in a better mood.

※Finding the humor in situations can also lead to happiness. Find a way to make light of a situation that would otherwise make you happy.

※Keeping healthy is another way to achieve happiness.　 75　 .

A．What makes one person happy may be very different from what makes someone else happy.

B．On the contrary, if you are around people who are happy, their emotional state will be infectious.

C．Being overweight or not eating nutritious foods can have a negative effect on your mooD．

D．These are important questions for anyone who is seeking happiness to ask themselves.

E．Spend a few minutes each day thinking about the things that make you happy.

F．There are some tips in life that lead to happiness.

G．It’s also important to take some time each day to do something nice for yourself.

(3)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

__71___ .Being angry doesn’t really solve much, but what people do when they feel angry is important. The goal is to calm down and try to solve what is bothering you. This is hard for some kids and adults, too. Instead of calming down, some kids might keep getting more and more upset until they explode like a volcano!

__72___ .Their anger might be so strong that they lose control of their temper. They may act in ways unacceptable and hurtful. People may say that someone has trouble controlling their temper.__73___

Some kids might get so angry that they scream at their parents, break something , or even worse , hit their brothers or sisters._74____ .However, it’s not OK for a kid to do any of those things .Kids don’t want to act in this way , but sometimes　　 angry feelings can be hard to manage. So what to do?

Well, the good news is that kids don’t just have to keep making the same mistakes over and over again.__75___ .Imagine your temper as a puppy inside you that needs some training. The puppy is not bad ---- it will probably turn out a great dog. It just needs to learn some rules because, right now, that puppy is causing some problems to you.

A. You can train you temper.

B.You don’t want to cause trouble.

C. Kids should be allowed to express their feelings, even angry ones.

D. Everybody gets angry sometimes.

E. In fact, they usually mean that a kid behaves badly when feeling angry.

F. Instead of thinking of the person you’re angry with, think of something else.

G. Some kids get angry more often or more easily than some other kids.

(4)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余项。

Choosing the right job is probably one of the most important decisions we have to make in life, and it is frequently one of the hardest decisions we have to make. One important question that you might ask yourself is: “How do I get a good job?”___71___.

There are people who can answer an insignificant advertisement in the local paper and land the best job in the world; others write to all sorts of places all over the country, and never seem to get a reply at all. Still others believe that the in person, door-to-door approach is by far the best way to get a job; and then there are those who, through no active decision of their own, just seem to be in the right place at the right time. ___72____. He used to spend a lot of his free time down by the sea watching the tall ships, but never thinking that he might one day sail one of them. His father was a farmer, and being a sailor could never be anything for the boy but an idle dream. One day, on his usual wandering, he heard the captain of the ship complaining that he could not sail because one member of his crew was sick. Without stopping to think, the lad(少年) offered to take his place. ___73___.

__74__. If the lad had gone home to ponder(考虑)his decision for a week, he may have missed his chance. It is one thing to be offered an opportunity; it is another thing to take it and use it well.

Sometimes we hear stories about people who break all the rules and still seem to land plum jobs(美差). When you go for a job interview or fill out an application, you are expected to say nice things about the company to which you are applying. ___75___. And within a year this person had become general manger of the company.

A．This story also illustrates the importance of seizing an opportunity when it presents itself.

B．People find jobs in an infinite number of ways.

C．it’s almost impossible to find a good job by answering advertisement in newspapers

D．Take for example the young man who wanted to be a sailor.

E．But there was one person who landed an excellent job by telling the interviewer all the company’s faults.

F．He spent the rest of his life happily sailing the ships he had always loved.

G．It is very important to seize an opportunity when it presents itself.

(5)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

_71_ One of the best things you can possibly do is to start you own club. It’s great fun especially if you are the sort of person who feels there’s never anything to do during the school holidays.

The first thing you need to come up with is an idea for your club. _72_ Pets, clothes, pop music or dancing groups, sports, making things? The list is endless.

Next you need some friends to be in your club with you. _73_ All you need is three or four other people who are interested in the same thing as you.

_74　 　You should all sit down somewhere together with lots of pieces of paper and write down every name you can think up. That’ll keep you busy for ages.

At your first meeting you should make up a rule book. And the first rule should be no grown-ups or little/big brothers or sisters! The best clubs are always secret!

Now you have just about everything you need, except membership cards. These are very important and again you can speed a lot of time making them. 75 Why not leave some space for a photo of yourself? That will make the membership card really look like it.

So there you are, get clubbing! Once you get started you’ll think of loads of more interesting things to do!

A．That’s easy.

B．Enjoy your own club!

C．Invite a designer to join you.

D．What are you interest in?

E．Some vacation is just around the corner.

F．Then you need to pick a name for your club.

G．Use a bright thick pen to make a special design.

(6)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Before going outside in the morning, many of us check a window thermometer(温度计)for the temperature. This helps us decide what to wear. _______71______ . We want our food to be a certain coldness in the refrigerator. We want it a certain hotness in the oven. If we don’t feel well, we use a thermometer to see if we have a fever. We keep our rooms a certain warmth in the winter and a certain coolness in the summer.

Not all the thermometers use the same system to measure temperature. We use a system called the Fahrenheit scale. But most other countries use the Centigrade scale.

Both systems use the freezing and boiling points of water as their guide._____72_______ .

The most common kind of thermometer is made with mercury(水银)inside a clear glass tube. As mercury (or any other liquid ) becomes hot, it expands. As it gets colder, it contracts(收缩). That is why on hot days the mercury line is high in the glass tube.______73______.

First. Take a clear glass juice bottle that has a cap; fill the bottle with coloured water. Tap a hole in the center of the cap using a hammer and thick nail. Put the cap on the jar. Then stick a plastic straw(吸管) through the nail hole.

_______74____________.

Finally. Place a white card on the outside of the bottle and behind the straw. Now you can see the water lever easily.

_______75___________.

As the temperature goes down, the water will contract, and the lever in the straw will come down. Perhaps you will want to keep a record of the water lever in the straw each morning for a week.

A. We use and depend on thermometers to measure the temperature of many other things in our daily lives.

B. Thermometers measure temperature, by using materials that change in the same way when they are heated or cooled.

C. Now that you know this rule you can make a thermometer of your own that will work.

D. The water will rise in the straw. As the temperature of the air goes up, the water will expand and rise even higher.

E. They label these in different ways. On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees. On the Celsius scale water freezes at 0 degrees and boils at 100degrees.

F. Take wax (you may use an old candle if you have one) and melt some of it right where the straw is struck into the cap to seal(把..粘住) them together.

G. People use thermometers which are made by themselves when travelling around the world.

(7)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Choosing the right job is probably one of the most important decisions we have to make in life, and it is frequently one of the hardest decisions we have to make. One important question that you might ask yourself is: “How do I get a good job?”___71___.

There are people who can answer an insignificant advertisement in the local paper and land the best job in the world; others write to all sorts of places all over the country, and never seem to get a reply at all. Still others believe that the in person, door-to-door approach is by far the best way to get a job; and then there are those who, through no active decision of their own, just seem to be in the right place at the right time. ___72____.He used to spend a lot of his free time down by the sea watching the tall ships, but never thinking that he might one day sail one of them. His father was a farmer, and being a sailor could never be anything for the boy but an idle dream. One day, on his usual wandering, he heard the captain of the ship complaining that he could not sail because one member of his crew was sick. Without stopping to think, the lad(少年)offered to take his place. ___73___.

__74__.If the lad had gone home to ponder(考虑) his decision for a week, he may have missed his chance. It is one thing to be offered an opportunity; it is another thing to take it and use it well.

Sometimes we hear stories about people who break all the rules and still seem to land plum jobs(美差). When you go for a job interview or fill out an application, you are expected to say nice things about the company to which you are applying. ___75___.And within a year this person had become general manger of the company.

A. This story also illustrates the importance of seizing an opportunity when it presents itself.

B. People find jobs in an infinite number of ways.

C. it’s almost impossible to find a good job by answering advertisement in newspapers

D. Take for example the young man who wanted to be a sailor.

E. But there was one person who landed an excellent job by telling the interviewer all the company’s faults.

F. He spent the rest of his life happily sailing the ships he had always loved.

G. It is very important to seize an opportunity when it presents itself.

(8)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

What is your favourite colour? Do you like yellow, orange, red? ___71___. Do you prefer greys and blues? Then you are probably quiet, shy, and you would rather follow than lead. You tend to be pessimist. At least, this is what psychologists tell us, and they should know, because they have been seriously studying the meaning of colour preference, as well as the effect that colours have on human beings. ___72___ . If you happen to love brown, you did so, as soon as you opened your eyes, or at least as soon as you could see clearly.

___73___. A yellow room makes most people feel more cheerful and more relaxed than a dark green one; and a red dress brings warmth and cheer to the saddest winter day. ___74___ . A black bridge over the Thames River, near London, used to be the scene of more suicides(自杀) than any other bridge in the area---until it was repainted green. The number of suicide attempts immediately fell sharply. Perhaps it would have fallen even more if the bridge had been done in pink or baby blue.

___75___. It is an established fact that factory workers work better, harder, and have fewer accidents when their machines are painted orange rather than black or grey.

A. On the other hand, black is depressing.

B. They tell us, among other facts, that we do not choose our favourite colour as grow up --- we are born with our preference.

C. The rooms are painted in different colours as you like.

D. If you do, you must be an optimist, a leader, an active person who enjoys life, people and excitement.

E. Light and bright colours make people not only happier but more active.

F. Life is like a picture or a poem, full of different colours.

G. Colours do influence our moods---there is no doubt about it