单项选择题

A．Twenty years.
B．Sixty years.
C．Forty years.
D．Eighty year.
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单项选择题
A．It’s environmentally friendly.B．It’s more efficient than other alternative fuels.C．It doesn’t destroy the ozone.D．It’s not economical to mass-produce.
A．It’s environmentally friendly.
B．It’s more efficient than other alternative fuels.
C．It doesn’t destroy the ozone.
D．It’s not economical to mass-produce.
单项选择题
A．Some famous people have graduated from such schools.B．Many people are taking their courses.C．Attendance at such schools is free.D．Correspondence schools offer a variety of courses.
A．Some famous people have graduated from such schools.
B．Many people are taking their courses.
C．Attendance at such schools is free.
D．Correspondence schools offer a variety of courses.
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