单项选择题

The word "dim" (para.4) probably means

A．promising
B．bright
C．hard
D．broad
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单项选择题
According to the first paragraph, the real reason for people to receive education is that they ______.
A．will earn s lot of money
B．will lead a happy life
C．will become more intelligent
D．can meet the demands of society as a source of manpower
单项选择题
What we could do in order to change the characteristics of plants and animals
A．We could alter the DNA genetic code.
B．We could select new breeding practices.
C．We could build new life forms.
D．We could add chemicals.
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