问题 单项选择题

下列关于哺乳动物精子发生的叙述,错误的是()

A.雄性动物在胚胎期减数分裂就能进行

B.次级精母细胞与精细胞染色体数目相同

C.精子的尾是由中心体演变而成的

D.不能游动的精细胞演变成可以游动的精子

答案

参考答案:A

多项选择题
阅读理解

There was an American writer who often told such a story to his friends and readers:

It was an exhibition of the artists’ works organized by the Red Cross. I was invited as a special guest to take part in the exhibition. During this period, two cute girls of 16 or 17 years old came to me and asked for my signature(签名).

“I haven’t brought my pen. Is the pencil okay?” I asked. In fact I knew they wouldn’t refuse. I just wanted to show a well-known writer’s good manners to the common readers.

“Certainly,” the young girls readily agreed. I could see they were very excited. Of course, their excitement also made me more pleased with myself. One of the girls handed her notebook to me. I took out my pencil, wrote a few words of encouragement, and signed my name. The girl read my signature, frowned(皱眉), looked at me carefully and asked, “Aren’t you Robert Charboss?”

“NO,”I told her proudly, “I’m the author of Alice Adams, the winner of two Pulitzer Prizes.”

The young girl turned to another one, and said, “Mary, lend your eraser to me.”

At the moment, all my pride turned into a bubble (泡沫) immediately. Since then, I always warn(告诫)myself:Don’t think too highly of yourself even though you are so outstanding(杰出的).

小题1:The writer went to the exhibition because he      .

A.would put out his new book

B.got a special invitation

C.wanted to meet his fans

D.wanted show off (炫耀) that he was an outstanding writer小题2:We can infer that the two girls were the fans of   .        

A.the writer

B.Alice Adams

C.Robert Charboss

D.the Red Cross小题3:The underlined sentence “all my pride turned into a bubble immediately” means that the writer     .

A.had realized that he was too proud of himself

B.felt very angry when he heard the girl’s words

C.was so polite to the girls and helped them a lot

D.was regret to sign his name for the girl小题4:This story teaches us to be a(an)    person.

A.careful

B.outstanding

C.modest

D.easy-going