题干

观察图车的外形,若车在水平路面上急速行驶,由于车上下表面空气流动速度不同,车对地面的压力会____,从而使车与地面之间的摩擦力____,车容易失控(填“变大”、“变小”或“不变”).汽车行驶时间长了,轮胎会发热,这是通过____的方式改变内能的.

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答案(点此获取答案解析)

变小,变小,做功

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阅读下面的短文,从短文后各题所给的A、B、C和D四个选项中,故答案选出可以填入空白处的最佳选项,。

    While high school does not generally encourage students to explore new aspects of life, college sets the stage for that exploration. I myself went through this1process and found something that has changed my2at college for the better: I discovered ASL------American Sign Language(美式手语).

    I never felt an urge to3any sign language before. My entire family is hearing, and so are all my friends. The4languages were enough in all my interactions(交往).Little did I know that I would discover my5for ASL.

    The 6 began during my first week at college. I watched as the ASL Club 7 their translation of a song. Both the hand movements and the very8 of communicating without speaking 9me. What I saw was completely unlike anything I had experienced in the 10.This newness just left me11more.

    After that, feeling the need to12 further, I decided to drop in on one of ASL club`s meetings. I only learned how to 13 the alphabet that day. Yet instead of being discouraged by my 14 progress, I was excited. I then made it a point to15 those meetings and learn all I could.

    The following term, I 16 an ASL class. The professor was deaf and any talking was 17. I soon realized that the silence was not unpleasant.18, if there had been any talking, it would have19 us to learn less. Now, I appreciate the silence and the 20 way of communication it opens.