我国人口的突出特点是
A:城镇人口比重大,农村人口比重小
B:人口分布均匀,东西差距不大
C:人口基数大,人口增长快
D:人口增长慢
根据对话内容,选择适当的选项补全对话,使对话完整。
A. She is a doctor. B. Yes. I have one aunt.
C. Good afternoon. D. Is this your aunt?
A: ____
B: Good afternoon.
A:____
B: No, this is my mother.
A: What does she do?
B:____
A: Do you have any aunts?
B:____ She is a nurse.
下列四幅图中,能反映出发电机工作原理的是( )
如图为反射弧模式图,李明不小心被针扎到,迅速缩手,对该反射的叙述正确的是( )