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The car burns too much gas, and ________, the price is almost twice as much as I intend to pay.

A. moreover
B. however
C. whilst

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To understand a great international event, we need to consider the _________background to it.

A. historical
B. history
C. historic

It is hard to imagine how our forefathers could do_______so many conveniences that modern technology has brought about.

A. with
B. without
C. by

According to Text A of Unit 3, it is impossible to stop science and technology from fruther developments because _____________.

A. the force of competition will bring about technological advances
B. one cannot stop inquiring minds from thinking about basic science
C. many governments have cut off funds in scientific research
D. human initiative and inventiveness will push forward the development of science and technology

When discussing on how to give the public an improved science education, the author puts forward the following suggestions -- ____________________.

A. improving science education in schools
B. publishing more of his books
C. replacing equations with words and diagrams
D. making use of popular media such as newspaper, magazines and above all, TV

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