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【单选题】
Which is the main idea about students in the 1960s?A.
They smoked marijuana.
B.
They took part in protests.
C.
They read books which were forbidden.
D.
They enjoyed their time at university.
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【单选题】The author raises issues that would most concern which of the following groups?
A.
Electricians.
B.
Environmentalists.
C.
Aviators.
D.
Teachers.
【单选题】The heat that is produced by burning garbage can be used to______.
A.
make electricity
B.
make energy source
C.
boil water
D.
save coal
【单选题】The process of producing electricity may also give out CO 2 , _____ you heat your house with electricity instead of charcoal. [ ]
A.
even if
B.
as long as
C.
as if
D.
as soon as
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