题目内容

Whether ________ or professional, American football is perhaps the most popular sport in the US. It attracts a total attendance of over 40 million and is watched by many more millions on television each year.

A. annual
B. assert
C. amateur
D. assemble

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The new system designed to ________ harmful emissions (排放物) from factories will be put into use soon.

A. curb
B. await
C. donation
D. polished

To make our companies ________ in the market, we have to be more creative and productive.

A. estimate
B. competitive
C. compensate
D. adopt

People are beginning to realize that to ______ nature at will is the biggest mistake that man has ever made.

A. solve
B. response
C. transform
D. focus

It is difficult to conclude what a() ______ student does in his spare time because every student has different interests.

A. adopt
B. typical
C. regulate
D. amazing

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