单项选择题

These tables showing the ups and downs of the world economy in the 1980's were compiled(汇编) ______ careful observation and detailed studies.

A．at the bottom of
B．in exchange for
C．in the name of
D．on the basis of
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单项选择题
We have to work even harder though we feel quite ______ our success.
A．secure of
B．nervous about
C．worried about
D．competent for
单项选择题
The government has strictly carried out the policy of birth control, thus resulting in the ______ of the population in our city.
A．turning down
B．dropping out
C．leveling off
D．holding up
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