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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Television broadcasts are (1) to an area that is within the (2) of the sending station or its relay (中转站). (3) television relays are often placed on hills and mountains so that they can (4) a wider r...
A.
books
B.
conference
C.
newspapers
D.
press
【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
【单选题】Kenya Wildlife Safari from ￡995DAY 1 LONDON/NAIROBIDaylight flight to Nairobi．On arrival, check in at the Holiday Inn Mayfair Court.DAY 2-4 SAMBURU AND TREETOPSSet off on safari, driving north, to the...
A.
traveling long distance
B.
spending nights outdoors
C.
watching animals in the wild
D.
seeing different kinds of plants