问题 问答题 简答题

基因学说的主要内容。

答案

参考答案:

(1)种质(基因)是连续的遗传物质;

(2)基因是染色体上的遗传单位,有很高稳定性,能自我复制和发生变异;

(3)在个体发育中,基因在一定条件下,控制着一定的代谢过程,表现相应的遗传特性和特征;

(4)生物进化,主要是基因及其突变等。

这是对孟德尔遗传学说的重大发展,也是这一历史时期的巨大成就。

完形填空
I became lame(瘸的)in both legs in my childhood. I can’t stand   36  the support of two sticks. Only in my wheelchair can I “   37  ”.
I still remember the first day at   38 . When I appeared at the door, 39   in the classroom stared(凝视)at me in   40 . My face turned   41 . I couldn’t help  42 back. It was the    43  and sympathy(同情)in their eyes that   44  me doing so. I went shyly towards an unoccupied (空的) seat.
Being lame, I didn’t dare (敢) to   45  in front of my classmates. I was afraid that I might be   46  at. In those days I was very sad to see others walking   47 .
One day, a few students came up to me and asked me to go outside. I was really   48 . They encouraged me with a(n)   49  smile and   50  me in my wheelchair from place to place. I was   51  to them for giving me a chance to see the   52  of our lovely school with my own eyes.
After that we often read, played and talked together. My friends are always   53   to help me. It made me   54  I am handicapped (残疾的).
Once they asked me, “What is the most beautiful thing in our school?” Without hesitation (犹豫) I said, “It is the   55 . ”
小题1:
A.withB.without C.under D.on
小题2:
A.walkB.runC.sitD.stand
小题3:
A.schoolB.wheelchairC.homeD.hospital
小题4:
A.he B.sheC.everyone D.nobody
小题5:
A.thought B.interest C.angerD.surprise
小题6:
A.red B.brown C.whiteD.black
小题7:
A.enteringB.hidingC.coming D.turning
小题8:
A.feelingB.kindness C.sorrowD.pain
小题9:
A.madeB.stoppedC.keptD.let
小题10:
A.walkB.studyC.practiceD.speak
小题11:
A.laughedB.smiledC.staredD.looked
小题12:
A.sadly B.slowlyC.happilyD.shyly
小题13:
A.braveB.sadC.hurtD.excited
小题14:
A.honestB.friendly C.luckilyD.handsome
小题15:
A.pushedB.placedC.drewD.pulled
小题16:
A.satisfiedB.sorryC.loyal D.thankful
小题17:
A.signsB.sights C.labsD.students
小题18:
A.readyB.smartC.wiseD.unwilling
小题19:
A.forget B.remember C.imagineD.think
小题20:
A.teachersB.schoolyard C.classmatesD.friendship
单项选择题 B1型题