单项选择题

A．Because they pollute air.
B．Because they are natural hazards.
C．Because they are increasing in numbers.
D．Because people don’’t walk so often.
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单项选择题
A．Because change happened so quickly.B．Because people were not interested in it.C．Because people were too busy with their work.D．Because change happened so slowly.
A．Because change happened so quickly.
B．Because people were not interested in it.
C．Because people were too busy with their work.
D．Because change happened so slowly.
单项选择题
A．The relationship between mice, rats and monkeys.B．The relationship between diet and animals.C．The relationship between diet and man.D．The relationship between diet and health.
A．The relationship between mice, rats and monkeys.
B．The relationship between diet and animals.
C．The relationship between diet and man.
D．The relationship between diet and health.
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