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单项选择题

A．inB．onC．aboutD．at……

A．in
B．on
C．about
D．at

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热门试题

填空题8:30

单项选择题A．originsB．storesC．potentialsD．sources

A．origins
B．stores
C．potentials
D．sources

单项选择题All books are cataloged according to

A．the author’s name.
B．the subject matter.
C．the publisher.
D．the title.

填空题How tall was the robber

单项选择题How many email messages did Americans send in 1999

A．2.2 billion.
B．2.2 million
C．293 million.
D．293 billion.