单项选择题

The birth control measures have helped to ______ the city’’s population.

A．hold up
B．hold off
C．hold on
D．hold down
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单项选择题
Where can I find Jim He is ______ his work. He won’’ t leave the lab until 6:00 p. m.
A．on
B．over
C．at
D．under
单项选择题
Sometimes, changing our way of thinking, ______.
A．the problems become simpler and clearer
B．we will find the problems simpler and clearer
C．the simpler and clearer the problems will become
D．the problems will become simple and easy
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