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.
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defence
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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