问题 读图填空题

长期以来优良种畜的繁殖速度始终是限制畜牧养殖业发展的瓶颈,近年来发展起来的细胞工程技术和胚胎工程技术为优良种畜的快速繁殖带来了无限生机。下面是科学加快速繁殖良种奶牛的两种方法,请据图回答:

(1)在试管牛E和克隆牛G的培育过程中都必须用到的两项技术是动物细胞培养和 _____________

(2)成熟的精子必须经过___________过程才具有受精能力。_________作用激活次级卵母细胞完成减数第二次分裂。

(3)科学家将人的α-抗胰蛋白酶基因转入上图的重构卵中,发现克隆牛G的乳汁中含人的α-抗胰蛋白酶,其原因是_______________。

(4)克隆牛G的性别是_____________,试管牛E的性别是________________。

(5)培育试管牛E时需对母牛B和母牛D注射激素,其目的是_____________,以便将胚胎移至母牛D的子宫内。

答案

(1)胚胎移植

(2)获能 受精

(3)克隆牛G的乳腺细胞中含有人的抗胰蛋白酶基因,并进行了表达

(4)雌性 雌性或雄性

(5)使母牛B和母牛D同期发情

选择题
阅读理解

阅读理解

     You're sitting on the train home and the person opposite you yawns ( 打哈欠). Suddenly , you're 

 yawning  with  him , though  you're not tired.

      This phenomenon confused scientists for years until a recent study found that people tend to

sympathize with fellow humans.Supporting this claim was the discovery that those children who were

unable to form normal emotional ties with others did not experience contagious (有感染力的) yawning,

which showed that humans communicate regularly without words.

     Hugo Critchley,a neuroscientist, has conducted an experiment recently, which will prove that

happiness and sadness can spread like the common cold. According to Critchley , our mind and body

are in constant exchange about how we're feeling. " Emotions are closely linked with states of internal

(内部的) responses. " he explained."There are also more visible changes in our gestures and facial

expressions. When we're in a group, these signals can spread to another person. For example, there's

the obvious tendency to smile when smiled at and there are less obvious, changes that reflect emotions

of surprise, anger or sadness such as a change in our heart rate and blood pressure. "

     Hugo Critchley further explained , " Our bodies synchronise and when we like the other person , we

even copy his behavior. Next time you chat with a friend, take note of how you're sitting-it's pretty likely

that you will be the same. Scientists believe it's our way of telling each other that we're partners. Through

body language, humans give each other very subtLe (微妙的) but clear signals that show emotions. "

    So,what lessons can we leam from this? " Spend time with happy people-otherwise your health could

suffer. " said Critchley. " When we're sad,our body goes into fight or flight mode. But when we're happy,

our body works normally and we feel relaxed and positive. So we look bright, our skin glows, we feel

healthy and it affects everyone around us. "

1. According to Hugo Critchley,__________.

A. emotions are as visible as facial expressions

B. we yawn more frequently when we have a cold

C. emotions are connected with states of internal responses

D. the change of blood pressure is not linked with the change ofemotions

2. The underlined word " synchronise"  in Paragraph 4 means"___________"    

A. move slowly                  

B. change rapidly

C. relax temporarily             

 D. respond accordingly

3. From the passage we can learn_________.   

A. sadness is as contagious as happiness

B. anger is less contagious than friendliness

C. surprise is more contagious than smile

D. surprise is the most contagious among emotions

4. Which of the following statements is TRUE according to the passage ?   

A. Emotions have delicate influence on fellow humans.

B. Children like copying the actions of fellow humans.

C. Scientists are still confused about contagious yawning.

D. People tend to communicate more with body language.