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问题 单项选择题

目前我国采用的围生(产)期是

A．妊娠满20周到产后4周
B．妊娠满28周到产后l周
C．妊娠满20周到产后1周
D．妊娠满28周到产后4周
E．胚胎形成到产后1周

答案

参考答案：B

写句子

照样子，写一写。     

例：小白兔种白菜。     

小白兔把白菜种上了。     

白菜被小白兔种上了。  

八路军消灭了全部的敌人。     

                                                                 

                                                                 

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选择题

. Only _____ in a foreign-funded enterprise ______ the importance of learning English well.

A．when I worked, I realized

B．when I worked, did I realize

C．when did I work, did I realize

D．when did I work, I realized
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