单项选择题

If we continue to destroy the countryside, many more animals will become ______.

A．distinct
B．distinguished
C．endangered
D．extinct
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单项选择题
To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world market demand.
A．improve
B．enhance
C．guarantee
D．gear
单项选择题
Sometimes ______ matters may result in surprising large effects.
A．predictable
B．big
C．trivial
D．imaginable
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