单项选择题

Limestone that can be highly polished is _______ marble.

A．substituted by
B．known as
C．regular as
D．improved by

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单项选择题

We must take _______ measures to protect the natural environment, otherwise, one million species that are alive today will have become extinct.

A．sharp
B．drastic
C．dramatic
D．sturdy

单项选择题

I was told that this material would not _______ in the wash but it has.

A．shrink
B．decrease
C．contract
D．reduce

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