30．thepeoplehavebecomemasterso

30． the people have become masters of their own country that science can really serve the people.

A．Only then

B．It is only when

C．Only when

D．It is only then

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_______ of food is in need nowadays in Africa.

A．A large number of	B．The amount of
C．A large amount of	D．Large amounts of

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A．of, waiting

B．with; wait

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