题目列表(包括答案和解析)
Laboratory work is your chance to learn science firsthand. It can be fun but you must be careful to prevent injury. Listen closely when your teacher reads and explains the rules before your first lab lesson.
LABORATORYRULES
Throughout the lesson
·Do not enter the science lab without the teacher’s permission.·No food or drinks are to be alowed in the science lab.
Before the Experiment
·Read al instructions carefuly before every experiment.
·Prepare al apparatus（仪器）and arrange them so that you wil not knock them over while doing the experiment.
During the Experiment
·If you are unsure of how to use any apparatus or how to operate, ask your teacher for help.·Never smel o
r taste chemicals unless your teacher gives permission.
After the Experiment
·Wash al apparatus after use and return them to the places where they were.
·Throw waste materials in proper waste baskets. First Aid
·Report al accidents to your teacher immediately.
·If you spil（ 溅 出 ）any chemicals onto your body or clothing, wash with plenty of water and report to your teacher.
【小题1】 Yo
ur teacher wil probably tel you the rules above _____ the first lab lesson.
| A．before | B．since | C．during | D．after |
| A．taste the chemicals first |
| B．clean al the apparatus |
| C．read al instructions carefuly |
D．report al the accident s to the teacher |
s clear that you can _____.A． bring food into the lab | |
| B．enter the lab anytime | |
C．smel chemicals as you like | D．learn science directly in the lab |
| A．Before the Experiment |
| B．First Aid |
| C．During the Experiment |
| D．After the Experiment |
任务型阅读
For a long time, scientists didn’t study animal thinking．Most of them did not believe that animals could think．They thought humans were the only thinking animals．
Now more scientists are studying this subject．But it’s very hard to prove things that no one can see or measure．So some scientists decided to take a look at brains．
Is bigger better?No．Cow brains are bigger than dog brains, but that doesn’t make cows smarter than dogs．And squirrels have some of the biggest brains of all for their body size．But squirrels aren’t even close to being the smartest animals in the world．So the size of a brain may give some clues(线索)about brain power, but it doesn’t prove anything．
Other scientists study thinking by ________ how animals solve problems．They watch animals in the wild or do thinking tests in a lab．
For example, the scientist might put some food just out of an animal’s reach．One kind of animal may grab a stick and use it to slide the food over．Another kind might not be able to figure out a way to get the food．Some scientists think animals that have lots of problems to solve must be smarter than animals with simple lives．Scientists also study certain kinds of behaviour for clues about thinking．They watch for three things：whether animals use tools, how they act with each other, and how they communicate．
1．“This subject” in Paragraph 2 refers to ________．
2．The underlined word “smarter” means ________ in English．(限填一词)
3．What have scientists learned from studying the size of animals’ brains?
________________________________
4．Complete the sentence with just one word：Other scientists study thinking by ________ how animals solve problems．(限填一词)
5．Scientists study such animals’ behavior as whether animals use tools, how they act with each other and ________ as well．
Early to bed, early to rise, makes a man healthy, wealthy and wise.
This is an old English saying. Have you heard of it before? It means that we must go to bed early and get up early in the morning. Then we shall be healthy. We shall also be rich (wealthy) and clever (wise).
This is true. The body must have enough sleep to be healthy. Children of young age should have ten hours’ sleep every night. Children who do not have enough sleep cannot do their work very well. They will not be wise and they may not become wealthy!
The body also needs exercise. Walking, running, jumping, swimming and playing games are all exercise. Exercise keeps the body strong. Exercise also helps the blood (血液) to move around inside the body. This is very important. Our blood takes food to all parts of our body. The head also needs blood .Exercise helps us to think better!
【小题1】If we get up early and go to bed early , we’ll _________ .
| A．have enough exercise | B．be healthy |
| C．think better | D．have strong blood |
| A．becomes wise | B．won’t do well in his work |
| C．goes to school in time | D．has enough sleep |
| A．it makes him healthy | B．he has a lot of homework to do |
| C．he is strong enough | D．he does exercise |
| A．body | B．blood | C．children | D．head |
| A．Exercise does good to a person’s head |
| B．A student should have 10 hours’ sleep |
| C．It’s good for you to get up early and go to bed early. |
| D．If you have enough blood, you’ll be wise. |
We’ve talked about snails (蜗牛) and their slow move. But much of the time snails don’t move at all. They are in their shells (壳) —sleeping.
Hot sun will dry out a snail’s body. So at the least sign of hot sun, a snail draws its body into his shell. A snail will die in a heavy rain. So when it rains, a snail does the same thing, too. A snail can sleep for as long as it needs to. It spends all the winter months in its shell, asleep.
In the spring the snail wakes up. Its body, about three inches long, comes out from the shell. When hungry, the snail looks for food. Its eyes, at the end of the top feelers (触角), are very weak. But its sense (感觉) of smell is very strong. It helps the snail to find food and the new greens.
A snail’s mouth is no bigger than the point of a pin (大头针). Yet it has 256,000 teeth! The teeth are very small, and you can’t see them. If you put a snail in a hard paper box, it will eat its way out! And if a snail wears out its teeth, it will grow new ones.
1. A snail _________.
A. moves more slowly at night B. has thousands of feet
C. doesn’t move at all D. sleeps much of the time
2. In the sentence “A snail draws its body into its shell”, the word “draw” means _____.
A. to make with a pencil B. to push C. to pull D. to move away
3. From the story, we know _________.
A. a snail’s shell is very thin B. a snail can’t see well
C. a snail’s nose is quite short D. a snail’s body changes in different seasons
4. A snail goes to sleep when _____.
A. it feels hungry B. it is put into a paper box C. spring is coming D. it rains heavily
5.Which of the following is wrong?
A. In winter the snail doesn’t eat or move. B. A snail doesn’t like living under the sun
C. The snail’s teeth can’t be worn out. D. The snail’s nose helps to find food.
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