问题 单项选择题

达尔文的自然选择学说与孟德尔的遗传定律分别奠定了进化理论与遗传学的基础,下面有关遗传和进化的分析,你认为正确的一项是()

①遗传是进化的基础,通过遗传使控制性状的基因在子代中得以延续和传递

②根据自由组合规律可知基因突变与基因重组为进化提供了丰富的原材料

③遗传出现性状分离,然后由自然选择淘汰不利变异个体、保留有利变异个体

④自然选择、基因重组、突变、种群过小,都会影响种群基因频率的稳定

A.①②

B.③④

C.①③

D.②④

答案

参考答案:C

阅读理解

阅读理解。

     Mr Jones and Mrs Brown worked in the same office. One day Mr Jones said to Mr Brown, "We

are going to have a small party at our house next Wednesday evening. Would you and your wife like to

join us?"

     Mr Brown said, "Thank you very much. That is very kind of you. We are free that evening. I think,

but I'll telephone my wife and ask her. Maybe she wants to go somewhere else that evening. "So Mr

Brown went to the other room and telephoned. When he came back, he looked very sorry.

    "What is the matter?" said Mr Jones. "Did you speak to your wife?"

    "No," answered Mr Brown, "She wasn't there, my small son answered the telephone. I said to him,

     "Is your mother there, David?' and he answered, 'No, she is not in the house,' 'Where is she then?' I

asked. 'She is somewhere outside.' 'What is she doing?' 'She is looking for me.'"

1. A small party will be held ______.

A. at David’s house                

B. at Mr Brown’s house

C. in the office                    

D. at Mr Jones’s house

2. Mr Jones asked ______ to the party.

A. Mr Brown        

B. Mrs Brown

C. Mr and Mrs Brown            

D. all his friends

3. Mr Brown spoke to ______ on the phone.

A. Mrs Brown      

B. Mrs Jones

C. David            

D. David’s friend

4. Why was Mrs Brown looking for David? Because ______.

A. he went out of the house

B. he was answering Father’s phone

C. she knew David had lost his way

D. she thought he was playing somewhere outside

问答题 案例分析题