单项选择题

Because weekend sailors can not always the wind, many sailboats have auxiliary engines.

A．bear upon
B．hold upon
C．count upon
D．come upon
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单项选择题
Mac’s close ______ to his brother made people mistake them for one another.
A．resemblance
B．identity
C．appearance
D．relationship
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
B．That the sun and not the earth
C．Being the sun and not the earth
D．The sun and not the earth
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