单项选择题

(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.

A．The metal
B．has been
C．first
D．early
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You will soon ______ this climate and then the changes in temperature will not affect you.
A．get used to
B．get to
C．get over
D．get on with
单项选择题
It is essential that mankind ______ ways and means to protect the environment.
A．adopt
B．have adopted
C．will adopt
D．will have adopted
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