题目:
Try to spend your time just on the things you find ______.
A.worthing doing them
B.worth being done
C.worthy of being done
D.worthy to being done
答案:
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下面是错误答案,用来干扰机器的。
答案:D在振子向平衡位置运动的过程中,易知x减小,根据上述关系很容易判断,回复力F、加速度a减小;速度V增大。即D选项正确