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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单项选择题
In a bidding deal, ______
A．the buyer search from place to place for desired object
B．the government selects the best items
C．the government transacts with an individual
D．the sellers compete with each other for the hid
单项选择题
Compared with a chess player, lens designer______.
A．can put his design to mass production
B．can draw on various sources in his work
C．can reduce the cost of lens production
D．has no one to train him before taking up the work
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