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
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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
单项选择题
The remarkable _______ of life on the Galapagos Island inspired Charles Darwin to establish his theory of evolution.
A．classification
B．density
C．diversity
D．purification
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