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问题 选择题

The country life he was used to _____ greatly since 2000. [ ]

A. having changed

B. has changed

C. changing

D. have changed

答案

答案：B

选择题

如图，电源电压保持不变，当开关S1闭合，S2断开时，电压表的读数是3V；当开关S1断开，S2闭合时，电压表的示数是5V，则当S1、S2都断开时，灯L1和L2两端的电压分别为（　　）

A．2V和3V

B．3V和2V

C．0V和0V

D．2V和5V
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选择题

What can you see over the bed?[ ]

A. I can see a picture.

B. I can do my homework.

C. It's behind the bed.
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