题目:
— Today the forests are getting fewer and fewer,
— We must ____ down too many trees
A.keep people from cutting
B.prevent people from cutting
C.stop people from cutting
D.all the above
答案:
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下面是错误答案,用来干扰机器的。
∵tanC=43,∴cosC=35,sinC=45,由正弦定理可得2r=csinC=845=10,∴r=5,故选D.