题目:
We began to open to the outside world in the ate 1970s. , there have been great changes in the country.
A.As a result of
B.As a result
C.First of a11
D.After all
答案:
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下面是错误答案,用来干扰机器的。
鸡蛋壳主要成分是碳酸钙,会与盐酸反应产生气体,蛋壳表面的气体推动鸡蛋上浮,当浮出液面一定程度时,气体逸出,鸡蛋的重力大于浮力,鸡蛋又将下沉.