单项选择题

A lens designer in the past______.

A．did their work better
B．did not use glass for making lenses
C．was usually poor
D．designed the lens all by himself
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单项选择题
By saying that the U.S. was now able to take its place among the arbiters of the world' s destinies (the second sentence in paragraph 1), the author means that the U.S. ______.
A．established itself as one of the big powers
B．was now directing the world on a new course
C．became mature as a nation
D．brought new rules to the world' s diplomatic play
单项选择题
The expression risk being eclipsed on the world stage (the last sentence in paragraph 3) means______.
A．risk being overpowered by other nations
B．risk being invaded by other countries
C．risk being left behind other countries economically
D．risk being many colonies
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