1.单选题- (共1题)
| A．观察卵子是否受精的重要标志是卵黄膜和透明带之间是否出现两个极体 |
| B．防止多精入卵的两道屏障是顶体反应和卵黄膜封闭作用 |
| C．标志着受精作用完成的是两原核融合形成合子 |
| D．胚胎从透明带内伸展出来的过程称为孵化 |
2.选择题- (共2题)
Chen Hui, Zhao Mei, Li Nan and Yu Jing are good friends, but they eat different foods for lunch. Here is their lunch menu (菜单).
Name | Food | Place | Price（yuan） |
Chen Hui | rice, chicken and carrots | Meiwei Restaurant(饭店) | 12.00 |
Zhao Mei | dumplings(饺子) | Hongmao Restaurant | 14.00 |
Li Nan | a hamburger | Jiazhou Restaurant | 15.00 |
Yu Jing | tomato and egg noodles | Baixing Restaurant | 10.00 |
Chen Hui, Zhao Mei, Li Nan and Yu Jing are good friends, but they eat different foods for lunch. Here is their lunch menu (菜单).
Name | Food | Place | Price（yuan） |
Chen Hui | rice, chicken and carrots | Meiwei Restaurant(饭店) | 12.00 |
Zhao Mei | dumplings(饺子) | Hongmao Restaurant | 14.00 |
Li Nan | a hamburger | Jiazhou Restaurant | 15.00 |
Yu Jing | tomato and egg noodles | Baixing Restaurant | 10.00 |
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【1】题量占比
单选题:(1道)
选择题:(2道)
-
【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：0
5星难题：0
6星难题：1
7星难题：0
8星难题：0
9星难题：0