单项选择题

A．One sixth of them are seriously polluted.
B．One third of them arc seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
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单项选择题
A．At 1:00.B．After 1: 15.C．After 12:15.D．Before 12:00.
A．At 1:00.
B．After 1: 15.
C．After 12:15.
D．Before 12:00.
单项选择题
A．Food is no longer a basic need for us, while it was for primitive people.B．We eat a wide variety of food.C．We no longer eat fruit that primitive people ever ate.D．We eat more food than primitive people do.
A．Food is no longer a basic need for us, while it was for primitive people.
B．We eat a wide variety of food.
C．We no longer eat fruit that primitive people ever ate.
D．We eat more food than primitive people do.
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