题目内容

What can we learn from the passage?

A. Music sharing has been a problem but schools can do much about it
B. Music piracy has been a problem but schools can do nothing about it
C. Music sharing is not a problem but music piracy is illegal

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Watch the part of "Progression of Health Issues" and number the information in the order they appeared.Step 1: ___à Step 2: _à Step 3: _à Step 4: ___

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催化剂装填时，为防止催化剂破碎，催化剂做自由落体运动的高度一般小于( )米。

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