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【单选题】Television broadcasts are 【C1】______ to an area that is within the 【C2】______ of the sending station or its relay (中转站)．【C3】______ television relays are often placed on hills and mountains so that the...
A.
limited
B.
bounded
C.
prohibited
D.
shifted
【单选题】Daylight Saving Time begins on Monday, April 3, 2005. People in most parts of the United States will turn their clocks ahead one hour. The official (正式的) time to turn your clock ahead is early in the ...
A.
Right.
B.
Wrong.
C.
Doesn’t say.
【单选题】Passage 18 We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for t...
A.
in warm air
B.
in cold air
C.
when it reaches the polar region
D.
only when the clouds are down low
【单选题】Mars Global Surveyor is the oldest of five NASA robotic devices, which is designed to find out signs that Mars once had water;and it had been taking detailed pictures of the red planet for a decade. U...
A.
its life
B.
its orbit
C.
its power
D.
its position