问题 选择题

如图是某物体做直线运动的v-t图象,由图象可得到的结果正确是

A.t=1s时物体的加速度大小为1.0 m/s2

B.t=5s时物体的加速度大小为0.75 m/s2

C.第3s内物体的位移为3.0 m

D.物体在加速过程的位移比减速过程的位移大

答案

BC

题目分析:、1s时的加速度为;故A错误;

5s时的加速度为;大小为,故B正确;

第3s内物体做匀速直线运动,位移为;故C正确;

由图可知,物体在加速过程的位移为;而减速过程的位移为;故D错误;

故选BC

点评:v-t图象表示的是物体的速度随时间变化的规律;图象的斜率表示物体的加速度;图象与时间轴围成的面积表示物体在这段时间内通过的位移.

阅读理解

At East China University of Science and Technology,students will get a coupon (优惠券) if they eat up their food.Students can collect coupons and exchange them for smallgifts, such as books, magazines, mobile phone covers and

hand warmers.

"It's been such a surprise," said Liang Zhaoyun, 19, astudent at the university in Shanghai. "It has given us onemore motivation to finish our food. "

The measure is part of a national "eat-up" campaign(行动) which is organized by students to deal with food waste on campuses(校园).

Why only on campuses, you might ask? Because according to a report by Xinhna News Agency,students waste twice as much food as the national average(平均).

The campaign on campus food waste is receiving attention across the country.

"The aim of the campaign is not only to encourage students to finish their food. We hope it can also encourage students to choose a more environment-friendly and healthy lifestyle," said Tao Siliang, secretary of the Youth League Committee at Shanghai University.

But some school food is poorly prepared, so students do not like to finish it all. Some schools have taken notice of this and they are taking measures to improve it.

"I'm glad that we've reduced food waste since the 'eat-up' campaign began. But if we call on students to waste less food, we should also improve the service and food standard on campuses." said Tao.

小题1:From Paragraph l,we know that the students will get a coupon .

A.when they eat school food

B.after they exchange gifts

C.if they finish all their food

D.if they collect the waste小题2:The undedined word "motivation" in Paragraph 2 means         in Chinese.

A.动力

B.机会

C.试验

D.条件小题3:The "eat-up" campaign is carried out on campuses because ________.

A.students get a good education

B.schools offer small gifts

C.students waste too much food

D.school food is more delicious小题4:The purpose of the campaign is mainly to ________ .

A.improve the school food standard

B.encourage a greener and healthier lifestyle

C.receive attention from the society

D.further improve the service in universities小题5:The best title for this passage may be _______.

A.Enjoy Your Food!

B.Reduce Waste on Campus

C.Meals in Universities.

D."Eat-up" Campaign on Campus

单项选择题