题目

67.从方框内选择恰当的句子完成下面对话。 Tom: Hi, Amy. Amy: Hi, Tom.  16   What’s wrong with you? Tom: I have a stomach ache. Amy: What did you eat for lunch? Tom:  17  Amy: I see. Maybe it is caused by them. Tom:  18  Amy: Do you often just have snacks for lunch? Tom: Yes, very often. Amy: Oh!  19   Snacks are bad for health. Tom: I know that.  20   But I really enjoy them. Amy: Anyway, you should try to eat less. Tom: You’re right. I’ll try. A.I ate nothing but some snacks. B.I hope so. C. You look happy. D. And my parents often tell me not to eat them. 受精过程的顺序为 ①第一次卵裂开始   ②释放第二极体   ③顶体反应    ④穿越透明带   ⑤雌、雄原核的形成   ⑥核膜消失，雌、雄原核融合 A．①②③④⑤⑥     B．③②④⑤⑥①     C．④⑤②①③⑥     D．③④②⑤⑥①