单项选择题


According to the speaker，in which country were the earliest known diamonds found

A．South Africa.
B．Eastern Russia.
C．India.
D．Congo.
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单项选择题
Compared with genetic engineering of food crops, genetic engineering of trees______.
A．began much later
B．has developed more slowly
C．is less useful
D．is less controversial
单项选择题
What does the man imply when he tells the woman not to get her hopes up
A．The director probably isn’t able to make an exception.
B．The director probably won’t see her.
C．The director usually isn’t very helpful.
D．The director usually isn’t responsible for part-time students.
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