单项选择题

All root vegetables grow underground, and not all vegetables that grow underground are roots（）.

A．but
B．or
C．as
D．thus

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单项选择题
A promising note is a written agreement to pay a certain sum of money at some time future（）.

A．time futures
B．futures
C．futures time
D．future time
单项选择题
All living creatures pass on inherited traits from one generation to other（）.

A．the other
B．another
C．others
D．other one
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