问题
单项选择题
There are（）operational satellites in the INMARSAT system covering the whole globe except the polar regions.
A.3
B.4
C.8
D.12
答案
参考答案：B
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There are（）operational satellites in the INMARSAT system covering the whole globe except the polar regions.
A.3
B.4
C.8
D.12
参考答案：B