单项选择题

_________ the rhinoceros is carefully protected, it will soon go the way of other extinct spe- cies.

A．If
B．Therefore
C．As long as
D．Unless
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_________ common potato scab, most scab diseases are caused by various fungi.
A．The
B．Not the
C．Except for
D．Only the
单项选择题
Don't look down upon the children who are below _________ intelligence.
A．medium
B．minor
C．middle
D．average
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