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单项选择题

A．expand
B．transform
C．economize
D．propagate
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热门试题

单项选择题A．inB．onC．aboutD．at

A．in
B．on
C．about
D．at

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.

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.

单项选择题Whom is the talk addressed to

A．Freshmen in the university.
B．Teachers of different backgrounds.
C．Students and teachers from computer college.
D．Regular MA students and in-service teachers.