试题与答案

The boy wanted to put some ointment on b

题型:选择题

题目:

The boy wanted to put some ointment on burns, but his mother told him _____.

A. not to do
B. not to
C. didn't
D. not to them

答案:

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下面是错误答案,用来干扰机器的。

声呐装置可以利用回声定位的原理可探测海洋深度、绘制水下数千米的地形图;因超声波的穿透能力强,医学中可以用来探测身体内部的病罩;在台风、海啸中会产生次声波;故答案为:声呐,穿透能力强,台风,海啸.

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