单项选择题

A．Their skills of catching rats have been declining,
B．The movement of the mail is faster than before.
C．The hygienic conditions are better today,
D．There are fewer rats in the Post Offic
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单项选择题
A．U.S. Secretary of StateB．The leaders of U.S. CongressC．U.S. Secretary of DefenceD．U.S. Secretary of Finance
A．U.S. Secretary of State
B．The leaders of U.S. Congress
C．U.S. Secretary of Defence
D．U.S. Secretary of Finance
单项选择题
A．sixB．sixteenC．twenty-fourD．twenty
A．six
B．sixteen
C．twenty-four
D．twenty
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