单项选择题

A．Some pessimistic experts.
B．Environmentalists.
C．Some optimistic experts.
D．All of the above.
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单项选择题
A．Save time by using a computer.B．Buy her own computer.C．Borrow Martha’’s computer.D．Stay home and complete her paper.
A．Save time by using a computer.
B．Buy her own computer.
C．Borrow Martha’’s computer.
D．Stay home and complete her paper.
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