单项选择题

In protest, blacks and sympathetic whites sat at the counters of these restaurants and refused to move until they were served.（）

A．considerate
B．sensible
C．warm-hearted
D．indifferent

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单项选择题
The brain drain of experts away from developing countries will greatly influence these coun tries' development of sophisticated industry.（）

A．principal
B．advanced
C．primitive
D．collective
单项选择题
They are confronting tremendous and more complicated problems.（）

A．discussing
B．solving
C．undertaking
D．facing
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