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A．Because it’’s prohibited by the government.
B．Because it’’s more inefficient than other alternative fuels.
C．Because it will destroy the ozone.
D．Because it costs a lot to mass-produce.
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单项选择题A．All men are created equal.B．The wounded and dying should be treated for free.C．A wounded soldier should surrender before he receives any medical treatment.D．A suffering person is entitled to help regardless of race, religion or political beliefs.

A．All men are created equal.
B．The wounded and dying should be treated for free.
C．A wounded soldier should surrender before he receives any medical treatment.
D．A suffering person is entitled to help regardless of race, religion or political beliefs.

单项选择题A．Peaches are in season now.B．Peaches are not at their best now.C．The woman didn’’t know how to bargain.D．The woman helped the man choose the fruit.

A．Peaches are in season now.
B．Peaches are not at their best now.
C．The woman didn’’t know how to bargain.
D．The woman helped the man choose the fruit.