单项选择题

A．Less than one year.
B．Four years.
C．Five years.
D．Ten years.
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单项选择题
A．He thinks it’’s mainly for children.B．He feels it would be worthwhile.C．He believes it is too complicated.D．He thinks it may not be very profitable.
A．He thinks it’’s mainly for children.
B．He feels it would be worthwhile.
C．He believes it is too complicated.
D．He thinks it may not be very profitable.
单项选择题
In 1950s and 1960s, Eastern societies noticed that resources for the provision of fossil fuel energy were finite and exhaustible.
A．Y
B．N
C．NG
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