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对任意实数x，恒有()．

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如题14图所示，A是半径为1的圆O外的一点，OA=2，AB是圆O的切线，B是切点，弦BC∥OA，连接AC．则阴影部分的面积等于 ()．

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Your wish to visit some far-off places can be realized by just reading books.

A. Right
B. Wrong

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What/Who should students contact if they want to get a summer job？

A. The Student Union.
B. The Student Employment Office.
C. The Workers' Union.
D. The Student Part-time Job Office.

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According to this passage, which of the following is NOT true？

Americans alone eat a great quantity of sandwiches annually.
B. Westerners like sandwiches very much.
C. Sandwiches are easy to clean-up.
D. Sandwiches are not nutritious.

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