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【单选题】
—Are you worried when your son often plays computer games? —Yes. I think playing too many computer games ______ on teenagers. [ ]A.
have a good effect
B.
has a good effect
C.
has a bad effect
D.
have a bad effect
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【简答题】速度控制回路是研究液压系统的速度________和________问题，常用的速度控制回路有调速回路、________回路、________回路等。
【单选题】--Could you be so kind as to turn down that rock 'n' roll? I am preparing for tomorrow's exam. --________.
A.
It’s none of your business.
B.
What are you doing?
C.
Sure. Sorry to disturb you.
D.
No, I don’t think so.