问题 选择题

受精作用、胚胎发育的场所分别是(  )

A.子宫、输卵管

B. * * 、子宫

C.输卵管、子宫

D. * * 、输卵管

答案

母体产生的卵细胞成熟后,由卵巢排出进入输卵管,在这里如果遇到精子,就会与精子相融合,形成受精卵,因此受精作用发生在输卵管;受精卵不断进行分裂,逐渐发育成胚泡;胚泡移动到子宫中植入子宫内膜,这是怀孕;胚泡中的细胞继续分裂和分化,逐渐发育成胎儿,胎儿通过胎盘、脐带与母体进行物质交换;怀孕到40周左右,胎儿发育成熟,成熟的胎儿和胎盘一起从母体的 * * 排出,即分娩,因此胚胎发育的场所是子宫.即受精作用、胚胎发育的场所分别是输卵管、子宫.

故选:C

完形填空

根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项.

小题1:  A team gets better. A kid practices more and swims a personal best or learns a new move on the basketball court. In 2006, two things happened that got me thinking about change—in sports and in life.

小题2:Agassi was a terrific player who won 60 titles, including eight major championships. But his greatest accomplishment might have been how much he changed during his career.

When he was young, Agassi was a showoff who seemed to care only about himself. He didn’t train very hard, but he won matches because of his tremendous talent. 小题3: He fell from No.1 in the world ranking to No.141.

So Agassi changed. He trained harder and become a world-class player again.  小题4:

He was nicer to fans and opponents. He stopped thinking just about himself and started thinking about others. Through his Andre Agassi Charitable Foundation, he raised more than $60 million to help disadvantaged kids around his hometown of Las Vegas, Nevada. He even started a school, the Andre Agassi College Preparatory Academy, for at-risk kids.

小题5:But they do happen. Just remember Andre Agassi. It wasn’t easy, but he changed, and changed for the better.

A.More important, he changed as a person.

B.Finally, everyone should remember that being an excellent player is a tough job.

C.Changes such as those can be difficult.

D.Sports are all about change.E. Eventually, though, injuries and his bad attitude caught up with him.

F. One of them is tennis champion Andre Agassi, who retired in 2006

G. What Agassi needed to learn was that he should train harder and perform better.

单项选择题