单项选择题

Some diseases are ______ by certain water animals.

A．transplanted
B．transformed
C．transported
D．transmitted
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单项选择题
When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
A．why it does
B．what it does
C．what it is
D．why it is
单项选择题
These goods are______for export, though a few of them may be sold on the home market.
A．essentially
B．completely
C．necessarily
D．remarkably
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