题干

将一个边长为4cm的正方体木块轻轻放入盛满水的溢水杯中,木块漂浮在水中静止时,从溢水杯中溢出水的体积为 38.4cm3;若将此木块改放入密度为 0.8×103kg/m3的酒精中,待木块静止时,下列说法正确的是(   )

A:木块露出酒精的体积为 16cm3

B:木块的密度为 0.6 kg/m3

C:从溢水杯中溢出酒精的体积为 38.4cm3

D:木块浸入水中的体积与浸入酒精中的体积之比为 5:4

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答案(点此获取答案解析)

A

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完形填空

    Dale Carnegie rose from the unknown of a Missouri farm to international fame because he found a way to fill a universal human need.

    It was a need that he first 1 back in 1906 when young Dale was a junior at State Teachers College in Warrensburg. To get an 2, he was struggling against many difficulties. His family was poor. His Dad couldn't afford the 3 at college, so Dale had to ride horseback 12 miles to attend classes. Study had to be done  4 his farm-work routines. He withdrew from many school activities 5 he didn't have the time or the  6. He had only one good suit. He tried 7 the football team, but the coach turned him down for being too 8. During this period Dale was slowly 9 an inferiority complex (自卑感), which his mother knew could 10 him from achieving his real potential. She 11 that Dale join the debating team, believing that 12in speaking could give him the confidence and recognition that he needed.

    Dale took his mother's advice, tried desperately and after several attempts 13 made it. This proved to be a 14 point in his life. Speaking before groups did help him gain the 15 he needed. By the time Dale was a senior, he had won every top honor in 16. Now other students were coming to him for coaching and they,  17, were winning contests.

    Out of this early struggle to 18 his feelings of inferiority, Dale came to understand that the ability to  19 an idea to an audience builds a person's confidence. And, 20 it, Dale knew he could do anything he wanted to do—and so could others.