单项选择题

The number of ______ species decreases every year as natural habitats disappear.

A．dangerous
B．endangered
C．scarce
D．risky
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单项选择题
They never cooperate while there's such a basis of interest between their ______.
A．protests
B．conflicts
C．contrasts
D．disputes
单项选择题
The main holiday was once confined to August; now it ______ into September.
A．expands
B．extends
C．enlarges
D．amplifies
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