单项选择题

The trucks ______ heavy goods-from factories to the ports.

A. pull

B. haul

C. drag

D. push

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单项选择题

To what extent will future scientific discoveries make possible the () of human life span

A. increase
B. expansion
C. growth
D. prolongation

单项选择题

To qualify for such a position, the native would first have to receive specialized training, and this is ().

A. refused
B. discouraged
C. denied
D. forbidden

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