It can be concluded that _____
A. Finnish people are not smart enough in daily life
B. Finland has been a good place for cheats
C. the Finnish society is of very high moral level
D. all the Finns are rich
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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
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.