单项选择题

We shall probably never be able to ______ the exact nature of these sub-atomic particles.

A．assert
B．impart
C．ascertain
D．notify
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单项选择题
According to this passage, the trend toward early marriages______.
A．can be clearly seen
B．is the result of the Great Depression of the 30’’ s
C．can’’t be easily determined
D．is an outgrowth of the moral looseness brought about by World War II
单项选择题
The office has to be shut down ________funds.
A．being a lack of
B．from lack of
C．to alack of
D．for lack of
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