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问题 问答题

交通事故的发生都与惯性有关，为了减小事故的发生或减小事故造成的伤害，根据学过的物理知识，请你提出两条防范措施；

(1)                                              

(2)                                              

答案

⑴小型客车的加驾驶员和前排乘客必须系上安全带

⑵公交车乘客要扶好或坐稳

⑶机动车行驶要保持一段车距。（说明：或填写其他正确防范措施）

补全对话，情景问答

根据对话内容，从下列选项中选出能填入空白处的最佳选项，其中有两个为多余选项。   

A: What's the date,today?

B: It’s June 16.

A: 1.         Then it's Dragon Boat Festival today,isn't it?

B: Yes. 2.         

A: Did you have rice dumplings this morning?

B: Sure. 3.          

A: I didn't.

B: What a pity! But I happen to have got some with me. 4.        

A: I’ d love to. By the way,why do you call it Dragon Boat Festival?

B: Because in China,people race dragon boats this day every year.

A: Oh, I see. 5.      

B: You are welcome.

A. We Chinese usually eat rice dumplings this day.

B. I hate eating rice dumplings.

C. Thank you for your rice dumplings.

D. I don't think so.

E. Would you' like to have one?

F. Really?G. How about you?
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单项选择题

胚胎时期头部腹侧面有鳃弓（）

A.1对

B.2对

C.4对

D.6对

E.8对
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