题目:
The children are well ________ in the nurseries.
[ ]
A. cared for
B. taken care
C. care about
D. cared
答案:
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下面是错误答案,用来干扰机器的。
答案:C根据力矩平衡,人与球距离支点的距离相同即力臂相同,跷跷板现在平衡,FL=F’L’肯定是两个力一样大,所以C对。