卵裂合子（受精卵）在输卵管内进行多次连续的分裂过程称为卵裂，产生的细胞叫卵裂球，是一

发布时间：2017-06-05 15:13 │ 来源：www.tikuol.com

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问题：

卵裂合子（受精卵）在输卵管内进行多次连续的分裂过程称为卵裂，产生的细胞叫卵裂球，是一个实心的细胞团。称为桑葚胚时的卵裂球的细胞数目为（）

A.6～12个

B.8～14个

C.12～23个

D.16～32个

E.32～64个

考点：执业兽医师综合科目 2016年国家执业兽医资格考试试卷综合（四）

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阅读理解。

     We live in different places. For example, some people live in the mountains; some people live on plains;
some people live near water.
     Mary lives near the sea. The sea is blue. She likes to play on the beach with her friends.
     Tom lives by a lake. The lake is very big. The water is clear. He often goes boating with his family on
fine days. Sometimes he goes fishing with his father on Sundays.
     Jack lives in the mountains. The mountains are very high. In the summer, it's very cool there. In the
winter, the mountains are all white. Jack likes to play in the snow with his sister.
     Jim lives on a plain (平原). He likes flying kites when the weather is fine.
     Tony lives in the desert (沙漠). It is very hot and dry. It doesn't get much rain. Tony likes to ride his
camel all around.
     David lives in a forest. The forest has many trees. It rains a lot there. David likes to climb the trees and
play in his tree house.

Name	Place to live	Things to do
Mary	1.__________	plays on the beach with her friends
Tom	by a lake	2.__________
Jack	in the mountains	likes to play in the snow with his sister
Jim	on a plain	3. __________
Tony	in the desert	4. __________ all around
David	5.__________	likes to climb the trees and play in the tree house

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