单项选择题

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 ft costs a tot to mass-produce.
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单项选择题
A．The students in Open University must have left school 20 years ago.B．The students in Open University are at least 21 years old.C．The students in Open University are only housewives.D．The students in Open University have to pass the entrance examination.
A．The students in Open University must have left school 20 years ago.
B．The students in Open University are at least 21 years old.
C．The students in Open University are only housewives.
D．The students in Open University have to pass the entrance examination.
单项选择题
A．Family phone numbers.B．Government service phone numbers.C．Business phone numbers.D．Professional services phone numbers.
A．Family phone numbers.
B．Government service phone numbers.
C．Business phone numbers.
D．Professional services phone numbers.
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