单项选择题

（）the center of our planetary system was considered as heresy by the church in the Middle Ages.

A. It is the sun and not the earth is
B. That the sun and not the earth is
C. Being the sun and not the earth is
D. The sun and not the earth is

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单项选择题
A nation’s merchant marine is made up of its commercial ships and people （）them.

A. they operate
B. who operate
C. they operate of
D. do they operate
单项选择题
1（）

A.prime
B.primary
C.primitive
D.prominent
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