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．如图所示，一束光线由某种介质射向该介质与空气的交界面，发生反射和折射．当入射角i=300时，折射光线与反射光线恰好垂直，则该介质的折射率为

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A B C
reallyneed.
D

A. to B. by C. for D. after

Which of the following statements is TRUE？
A There are many cases indicating that private schools are superior to public schools.
B The author thinks diversity of education is preferable to uniformity of education.
C A high-quality university is always a good business.
D Each time fees are raised, the enrollment goes up.

You may depend on ____ will not repeat his mistakes.

A. it that B. that C. him that D. which that