单项选择题

What is the best way to care for a baby, according to the passage

A．Let babies stay with other babies.
B．Take the babies to work.
C．Adults should care for children
D．It is best to hire a baby-sitter.
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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
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
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