问题 选择题

如图所示的四个事例中,用于增大压强的是

A.推土机上安装两条履带

B.铁轨铺在枕木上

C.用滑雪板滑雪

D.把刀刃磨薄

答案

答案:D

A、推土机上安装两条履带是通过增大受力面积的办法来减小压强的;

B、铁轨铺在枕木上,枕木较宽就是通过增大受力面积的办法来减小压强的;

C、用滑雪板滑雪,滑雪板做的比较宽就是通过增大受力面积的办法来减小压强的;

D、把刀刃磨薄,受力面积减小,在压力一定时减小受力面积可以增大压强.

故选D.

完形填空

Directions; Complete the following passage by using the words in the box.Each word can only be used once.Note that there is one word more than you need.

A.survey      B.off          C.better      D.care     E.conducted

F.differed.   G.personal     H.prepared    I.contrast    J.differences,

GAN Xiaolin, 18, only gets half a day __小题1:__ school every week since the Hubei student started senior high school.Every day, he takes core (核心的) courses from 7:10 am to 10:30 pm.

Sometimes, Gan feels extremely stressed from the heavy workload.But he hopes that his three

years of hard work toward the college entrance examination will change his life for the _小题2:_.

Gan is a typical Chinese student, as shown m a recently released survey.The new survey, which was __小题3:__ by the China Youth and Children Research Center and other foreign institutions, polled(调整) about 4,000 high school and vocational school students in China, Japan, the United States and South Korea.

The five biggest frustrations listed by all the young people were: an over-busy school life, an empty_小题4:__ life, dissatisfaction with their appearance, a lack of time for exercise and friends, and no spare money.

Although some of the teenage problems were y-niversai, there were big _ _小题5:_ between the students when it came to the time they spent on sehoolwork.

For example, Chinese students spent the most time at school and on homework.Nearly 80 percent of them spent at least eight hours a week in school, and 56.7 percent spent two or more hours on their homework.By_小题6:, only about 25 percent of US students, 20,5 percent of Japanese students, and 15 percent of Korean students had more than two hours of homework each night.

The responses from the Chinese students also _小题7:_ significantly from their peers (同龄人)

in the other three countries when asked about their life goals.

Only 16.7 percent of Chinese students said that they didn't __小题8:_ much about their future, while the figure for that category was 72.4 percent for US students, 59.1 percent for the Japanese and 58.2 percent for the South Koreans.The _小题9: found that Chinese students were more motivated than the other students to work hard for a better life.

单项选择题 A1型题