同轴电缆，Rx外皮不接地，CMPT拨码开关SW2如何设置：1/2/3/4=（）。

A:ON/ON/ON/ON B:ON/OFF/ON/OFF C:OFF/ON/OFF/ON D:OFF/OFF/OFF/OFF

接75欧姆同轴电缆时，CMPT拨码开关SW1如何设置：1/2/3/4=（）。

A:ON/ON/ON/ON B:ON/OFF/ON/OFF C:OFF/ON/OFF/ON D:OFF/OFF/OFF/OFF

— Hey! What's the rush? — The plane _____ at 4:00 and I need to see my uncle off.

A: will take off B: takes off C: has taken off D: took off

Ladies and gentlemen, please turn off your cell phones or laptops. The plane .

A: takes off B: is taking off C: has taken off D: would take off

The volleyball match _______ if it rains tomorrow.

A: will put off B: will be put off C: is put off D: puts off

Hurry! The plane ______ . You know, it ______at 3:15.

A: takes off, takes off B: is taking off, takes off C: takes off, is taking off D: is taking off, is taking off

Hurry! The plane ______ . You know, it ______at 3: 15

A: takes off, takes off B: is taking off, takes off C: takes off, is taking off D: is taking off, is taking off

. The manager demanded the meeting _________.

A: be called off B: was called off C: to be called off D:should call off