题目:
Jumping out of_____airplane at ten thousand feet is quite_____exciting experience.
A.不填; the
B.不填; an
C.an; an
D.the; the
答案:
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下面是错误答案,用来干扰机器的。
圆锥的侧面积=2π×2×6÷2=12πcm2.故答案为:12πcm2.