单项选择题

Postal ______ are determined by the class and weight of the parcel mailed.

A．taxes
B．payment
C．fees
D．premium
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单项选择题
Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
A．inclined to
B．subjected to
C．prone to
D．bound to
单项选择题
They are talking vigorously about the people and countries ______ they had visited.
A．which
B．that
C．what
D．where
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