题目内容
勤换气，是相对的不是绝对的。
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The American entertainment industry is extremely __1__, which influences the way people see America.It also becomes easier for Americans to see __2__ as __3__.One thing to keep in mind when you watch a Hollywood movie is that you should not __4___ everything you see.
Americans love sports.The biggest sports in America are __1__, __2__, __3__ and __4__
进料容量指可装入搅拌机的材料体积之和装料不能超过进料容量的( )。
搅拌时间过短,混凝土不均匀,( )
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