如图所示，平静的水面上有一座石桥，桥孔看上去是原形的。当水面上升时，看到桥孔的形状的是下图中的
A.
B.
C.
D.
答案：B
单句改错.
1. lt is snow right now. ( )
A B C D
2. It's cold in the morning but turn warm at noon. ( )
3. It's hot in day and cold at night. ( )
A B C
4. There are lots of money in the bank. ( )
5. Right now, they play happily here. ( )
要用非屏蔽双绞线组建局域网，需要购买带（）接口的以太网卡。
A、RJ—45
B、BNC
C、AUI
D、F/O
