皮皮学，免费搜题
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搜题
【单选题】
噪声的传播途径有 : ( )A.
空气传声，固体传声
B.
撞击传声，固体传声
C.
撞击传声，空气传声
D.
空气传声，漫反射传声
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皮皮学刷刷变学霸
举一反三
【单选题】A person ______ is more likely to become a genius.
A.
whose parents are clever
B.
often thinking about difficult problems
C.
often helped by his parents and teachers
D.
born with a good brain and putting it into active use
【简答题】对于人眼来说,若每秒播放大于____帧就会产生平滑和连续的画面效果。
【单选题】This camera is too expensive. I ’ d like a _____ one.
A.
cheap
B.
cheaper
C.
cheapest
D.
more expensive