设函数f(x)连续，则下列函数中，必为偶函数的是()．
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All of the following were taken as measures to guard against click fraud EXCEPT
A. the collaboration between an enterpriser and advertisers.
B. the installation of a defense system.
C. the application of certain software.
D. the employment of some statisticians.
The purpose of this passage is ______.
A. to tell people how the principle of freedom of press was established
B. to show the significance of the trial
C. to tell people where the expression "as smart as a Philadelphia lawyer" comes from
D. to tell people something special about the Philadelphia lawyer
Which of the following statements is true？
A. In Mr. Hamilton's opinion, Only when the words are proved slanderous can the writer of the words proved guilty of slander.
B. Mr. Zinger was proved innocent because he criticized the tyrannical governor.
C. Mr. Zinger made up stories about the governor in the newspaper.
D. Nobody wanted to defend Mr. Zinger because he had come from Germany.
John Zinger was arrested ______.
A. because he was smart as a Philadelphia lawyer
B. because he criticized the Governor in the newspaper
C. because of his stupidity
D. because the Governor was powerful
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