单项选择题

Which of the following was seen as a disadvantage of the postage stamp

A．It was very easy to counterfeit.
B．It increased the cost of mail delivery.
C．It was difficult to affix to letters.
D．It had to be purchased by the sender in advance.

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单项选择题

A student may pay the least tuition if he studies________.

A．at a community college within his own state
B．at a public university
C．within his own state
D．at a four-year college

单项选择题

Whenever I am in trouble, he is sure to help me out. I've________.

A．never met a kind man
B．ever met a kind man
C．ever met the kindest man
D．never met a kinder man