问题 读图填空题

下图为经过体外受精和胚胎分割移植培育优质奶牛的过程,请据图回答:

(1)在进行体外受精前要对精子进行_____________处理。②指的是______________。

(2)进行胚胎分割时,应选择发育到__________时期的胚胎进行操作(在操作时要注意将___________均等分割)。

(3)通过胚胎分割产生的两个或多个个体具有相同遗传性状的根本原因是______________。

(4)移植后的胚胎能在受体子宫中存活的生理基础是受体子宫对外来胚胎_______________。

答案

(1)获能;囊胚腔

(2)桑葚胚或囊胚;内细胞团

(3)具有相同的遗传物质

(4)不发生排斥反应

判断题
完形填空

The students at Sandy’s high school were badly shaken by the news that a classmate had  36 himself. The suicide note read: “It’s hard to  37 when nobody cares if you die.”

Glen, a teacher, realized this was a  38 moment about the importance of making people feel

39 . He asked his class to imagine they were about to  40  and to write a note “telling someone how and why you  41 him or her.”

Sandy, who had a  42  relationship with her mother, decided to write her  43 . Her letter read: “We’ve had some  44 times and I haven’t always been a very good 45 ,but I know I’m lucky to have you in my life. You’re the  46 person I’ve ever known, And even when I disagree with you, I never  47 you love me and want what’s best for me. Thanks for not  48 up on me”.

When her mom read the note, she cried and hugged Sandy  49 but said little.

The next morning, Sandy found a  50  on her mirror: “Dearest Sandy, I want you to know being your mother is ,by far, the most important thing in my life.  51 I got your note, I thought I had lost your love and  52 . I felt like such a failure. I intended to  53 it all last night. Your note saved my  54 .”

Be careful not to underestimate the  55 of expressed appreciation. It won’t always save a life, but it will always make someone’s life better.

小题1:          

A.sacrificed

B.defeated

C.abandoned

D.killed小题2:          

A.live

B.imagine

C.struggle

D.think小题3:          

A.sad

B.final

C.teachable

D.great小题4:          

A.ashamed

B.valued

C.excited

D.scared小题5:          

A.die

B.fail

C.retire

D.survive小题6:          

A.miss

B.hate

C.admire

D.appreciate小题7:          

A.close

B.casual

C.bad

D.personal小题8:          

A.classmate

B.mom

C.father

D.teacher小题9:          

A.free

B.delightful

C.pleasant

D.rough小题10:      

A.daughter

B.student

C.friend

D.trainer小题11:      

A.best

B.wisest

C.luckiest

D.gentlest小题12:      

A.trust

B.doubt

C.consider

D.predict小题13:      

A.taking

B.going

C.giving

D.looking小题14:      

A.coldly

B.hesitantly

C.shyly

D.tightly小题15:      

A.note

B.gift

C.notice

D.reminder小题16:      

A.Since

B.Until

C.though

D.When小题17:      

A.confidence

B.courage

C.respect

D.heart小题18:      

A.end

B.make

C.get

D.fall小题19:      

A.life

B.time

C.money

D.honor小题20:      

A.push

B.price

C.meaning

D.power