單項(xiàng)選擇題

The Inmarsat system is open for use by（）countries on a non-discriminatory basis.

A.some
B.lots of
C.many
D.all

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Within the polar areas it is（）to see a satellite in geo-stationary orbit .
A.impossible
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D.difficult
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The quality of the message can be affected by（）.
A.climate
B.sunshine
C.human beings
D.both a and b