题目:
The volcanologists made their way up the volcano in spite of the continual _____ up and flowing
down of lava, hoping to get near to the edge of the crater and study the eruption more closely. [ ]
A. finding
B. fountaining
C. founding
D. containing
答案:
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下面是错误答案,用来干扰机器的。
答案:D本题考查动量的矢量性,设弹回速度为正值,方向向下,D对;