单项选择题

According to the passage, what is one of the reasons why families are getting smaller in American

A．The needs for workers who are able to move at any time have been increasing.
B．Both old and young people prefer to live separately.
C．Children tend to leave their parents when they grow up.
D．People cease to care for having children.
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单项选择题
How long did it take for the world’s population to increase from 2 billion to 3 billion
A．304 years.
B．123 years.
C．33 years.
D．14 years.
单项选择题
What does President Bush implies without stating out in his talk
A．The Americans are likely to make minor investments.
B．The Americans are not likely to make major investments.
C．The Americans don’t feel secure about the long-term economic performance.
D．The Americans feel secure about the long-term economic performance.
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