在三棱锥S﹣ABC中,E,F分别为SB,SC上的点,且EF∥面ABC,则( )
A:EF与BC相交
B:EF∥BC
C:EF与BC异面
D:以上均有可能
补全对话
从方框中选择最佳选项完成对话, 有两项多余
A. Oh, I see.
B. They’re buying food and vegetables.
C. We’re having a good time.
D. some people aren’t shopping
E. Why are some of them going away in a hurry?
F. Thank you.
G. They are choosing and talking.
A: Look! There are many people in the shop. What are they doing?
B: ____
A: Yes, but____ in the shop. What are they doing in the shop?
B:____
A:____
B: Because they are leaving for home.
图中实线为锋线且正向西北方向移动,虚线范围内为雨区。读图回答下列各题。
下列各项中,能看做一个生态系统的是( )