0  391549  391557  391563  391567  391573  391575  391579  391585  391587  391593  391599  391603  391605  391609  391615  391617  391623  391627  391629  391633  391635  391639  391641  391643  391644  391645  391647  391648  391649  391651  391653  391657  391659  391663  391665  391669  391675  391677  391683  391687  391689  391693  391699  391705  391707  391713  391717  391719  391725  391729  391735  391743  447090 

3.(2010·河源模拟)转氨酶是肝细胞内参与氨基酸分解与合成的一类酶,正常情况下这类酶不会排到细胞外,若在细胞培养液中检测到该类酶,可能的原因是     ( )

A.肝细胞癌变       B.肝细胞分化

C.肝细胞膜受损      D.肝细胞衰老

解析:细胞膜具有选择透过性,正常情况下转氨酶不会排到细胞外,一旦在细胞外 检测到,必然是膜受损,失去了选择透过性。

答案:C

试题详情

2.如图a和b是两种细胞器,下列叙述中正确的是               ( )

A.两种细胞器在动植物细胞中的功能相同

B.b细胞器可能存在碱基互补配对现象

C.将肝细胞置于含有3H标记的亮氨酸的培养基中培养,放射性先出现在b,后出现在a

D.a与合成多糖有关,b与合成脂质无关

解析:a是高尔基体,b是内质网。高尔基体在动植物细胞中功能不同。内质网上不可能发生碱基互补配对。内质网是多糖及脂质合成的车间。

答案:C

试题详情

1.(2009·上海高考)下列关于真核细胞结构和功能的叙述中,错误的是     ( )

A.抑制线粒体的功能会影响主动运输

B.核糖体由RNA和蛋白质构成

C.有分泌功能的细胞才有高尔基体

D.溶酶体可消化细胞器碎片

解析:高尔基体的功能在动植物细胞中不同,在动物细胞中与细胞分泌物的形成有 关,在植物细胞中还与细胞壁的形成有关,所以在没有分泌功能的植物细胞和有分泌功能的动物细胞中都有高尔基体。

答案:C

试题详情

One of my fondest memories as a child is walking by a river,enjoying the peace and quiet.When feeling a bit tired,I would sit  1  on the bank,watching the bamboo trees bend under the  2  from the wind and watch them gracefully  3  standing upright after the wind had died down.

When I think about the bamboo tree's  4  to bounce back,the word resilience(适应力)comes to mind.When used in reference to a person,it means the ability to readily  5  from shock,depression or any other  6  that stretches the limits of a person's  7 .

Have you ever felt like you were at your  8  point-You were feeling emotionally worn out,mentally  9   and you were likely suffering unpleasant  10  symptoms?Luckily,you have  11  the experience to live to talk about it.You should be thankful now  12  you have learned something new,no matter whether you succeeded or not.

Life is a  13  of good times and bad times.Some moments are really  14  time you are experiencing one of those  15 ,just follow the example of the bamboo trees:bend but  16  quit.Success is produced from the problems you face.Those who refuse to give in can  17  it.

Remember,an optimistic outlook helps you.Always having  18  will take you through the unpleasant ordeal (苦难的经历). 19  the picture of a better tomorrow in your mind,things may not be as  20  as they seem to be.

1.A.quickly         B.carelessly

C.lazily         D.slowly

解析:这里根据上文的tired判断应该选C,即lazily。

答案:C

2.A.blow         B.pressure

C.touch         D.hit

解析:能使竹子弯曲的应该是风的压力。

答案:B

ge into       B.escape from

C.return to        D.turn to

解析:根据下文的“bounce back”,可知这里指竹子恢复原状。

答案:C

4.A.ability          B.attempt

C.intention         D.eagerness

解析:这里指竹子具备这种能力。

答案:A

5.A.recover       B.refresh

C.regain       D.remove

解析:这里指人在受到情感的打击后恢复正常。

答案:A

tent         B.situation

C.environmen t      D.example

解析:这里指“震惊、沮丧或其他情形”。

答案:B

7.A.emotions       B.body

C.health        D.intelligence

解析:震惊、沮丧应该属于情感方面的。

答案:A

8.A.breaking         B.starting

C.sticking          D.turning

解析:breaking point崩溃点。

答案:A

9.A.dull           B.tired

C.peaceful        D.excited

解析:这里应选与worn out意思相近的词。

答案:B

10.A.healthy         B.physical

C.psychological       D.spiritual

解析:这句话说明人在压力之下的各方面的症状,与情感,精神并列的,自然是身体。

答案:B

e across       B.got through

C.passed by         D.won over

解析:尽管你经历了许多的困难,幸运的是,你现在能描述这些经历,说明你已经顺利渡过了难关。

答案:B

12.A.because       B.once

C.till         D.when

解析:这里为因果关系。

答案:A

ection        B.matter

C.mixture         D.test

解析:既然生活中既有good times又有bad times,它肯定是混合物。

答案:C

14.A.doubtful        B.harmful

C.painful         D.shameful

解析:painful与uncomfortable搭配意思通顺。

答案:C

15.A.hardships       B.moments

C.successes        D.times

解析:与前面的“some moments”一致。

答案:B

16.A.already       B.ever

C.never         D.only

解析:根据前文意思,竹子虽然在风的压力下弯曲,但大风过后就会恢复直立。因此这里应是“从不放弃”。

答案:C

17.A.make        B.do

C.give         D.take

解析:make it=succeed成功,达到目的。

答案:A

18.A.courage       B.hope

C.friends        D.wisdom

解析:根据前面的an optimistic outlook及后文的“the picture of a better tomorrow”,这里应填“希望”。

答案:B

19.A.By         B.Through

C.In          D.With

解析:这里是with复合结构。

答案:D

20.A.bad        B.good

C.easy        plex

解析:这里选bad,与前面的unpleasant呼应。D项为中性词,不能表达出痛苦的意思。

答案:A

试题详情

15.He asked me    I would like to see a film with him.

A.that         B.if

C.what        D.which

解析:考查宾语从句中的连接词。句意:他问我是否想和他一起去看电影。由句意可知B项正确。

答案:B

试题详情

14.I    in front of the television for the evening.

A.settled             B.settled into

C.settled on            D.settled down

解析:settle down在此意为“使自己处于舒适的位置”。settle解决,定居,安家;settle into(使)适应……;settle on决定,选定。

答案:D

试题详情

13.I haven't seen you for ages.How are you    with your English study?

A.going along        B.going on

C.keeping on        D.getting along

解析:get along进展;go along一道走;go/keep on继续,由句意知选D项。

答案:D

试题详情

12.Iraq has    too many wars,making people    a lot.

A.got through;pay

B.looked through;face

C.gone through;suffer

D.passed through;destroy

解析:句意:伊拉克经历了那么多的战争,使得人们遭受了很多痛苦。go through经历,经受;suffer受痛苦,受损害;get through干完(工作等),接通(电话);look through审核,浏览;pass through经过,通过。

答案:C

试题详情

11.-My God!I'm getting late again.What will my boss say?

-Try to keep   ;we'll think of an excuse.

A.silent        B.calm

C.still          D.quiet

解析:考查形容词辨析。句意:“天哪!我又要迟到了。老板会说什么呢?”“尽量保持镇静,我们会想到一个借口的。”calm强调内心“沉着的,镇定的”,或指大海“无浪的”,天气“无风的”;still指完全没有声响并且是静止不动的;quiet强调声音很低的,用于人时,指性情温和、不易激动的;silent主要指不出声的。calm符合句意。

答案:B

试题详情


同步练习册答案