问题
不定项选择
关于悬浮在液体中的固体微粒的布朗运动，下列说法中正确的是 [ ]
A．小颗粒的无规则运动就是分子的运动
B．小颗粒的无规则运动是固体颗粒分子无规则运动的反映
C．小颗粒的无规则运动是液体分子无规则运动的反映
D．因为布朗运动的剧烈程度跟温度有关，所以布朗运动也可以叫做热运动
答案
答案：C
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关于悬浮在液体中的固体微粒的布朗运动，下列说法中正确的是 [ ]
A．小颗粒的无规则运动就是分子的运动
B．小颗粒的无规则运动是固体颗粒分子无规则运动的反映
C．小颗粒的无规则运动是液体分子无规则运动的反映
D．因为布朗运动的剧烈程度跟温度有关，所以布朗运动也可以叫做热运动
答案：C
完形填空（共20小题；每小题1.5分，满分30分） 阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 I teach biology at UNLV three times per week . Last Monday , at the beginning of class , I cheerfully asked my 21 how their weekend had been . One young man said that his weekend had not been so 22 . He had his wisdom teeth removed . Then he went on to ask me why I always seemed to be so 23 . His question 24 me of something I’d read somewhere before : “Every morning when you get up , you have a 25 about how you want to deal with life that day .” I said . “I choose to be cheerful .” “Let me give you an example ,” I continued , 26 all sixty students in the class . “In 27 to teaching here at UNLY , I also teach out at a 28 in Henderson , 17 miles down the highway from where I live . One day a few weeks ago I drove those 17 miles to Henderson . I 29 the highway and turned onto College Drive . I only had to drive another quarter mile down the road to the college . But just then my car 30 .I tried to start it again , but the 31 wouldn’t work . 32 I turned my flashers on , took my books , and 33 down the road to the college .” “As soon as I got there , I called and 34 for a tow truck to meet me at my car after 35 . The secretary there asked me what had happened . ” This is my 36 day .” I replied , smiling . She was 37 . “What do you mean ?” “My car could have broken down anywhere along the highway . It didn’t .” I relied . “ 38 , it broke down in the perfect place : off the highway , 39 walking distance of here . I’m still able to teach my class , and I’ve been able to get the tow truck to meet me after class . If my car was meant to break down today , it couldn’t have been arranged in a more convenient 40 .” I ended my story . In spite of the early hour , no one in my class seemed to be asleep . Somehow , my story had touched them .
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