问题 选择题

关于位移和路程,下列说法中正确的是(  )

A.物体沿直线向某一方向运动,通过的路程就是位移

B.物体沿直线向某一方向运动,通过的路程等于位移的大小

C.物体通过一段路程,其位移可能为零

D.物体通过的路程可能不等,但位移可能相同

答案

BCD

题目分析:位移是矢量,路程是标量,沿单方向做直线运动的物体的位移的大小和路程相等,所以A错误;B正确;比如运动员绕着圆形操场运动了一圈回到初始位置时,路程不为零,但是位移为零,C正确,路程不相等,但位移可能相同,比如从A地到B地,有不同的运行轨迹,但位移相同.故D正确.

故选BCD

点评:位移的大小等于初末位置的距离,方向由初位置指向末位置.路程是运动轨迹的长度.

阅读理解

第三部分:阅读理解(共两节,40分)

阅读下列短文,从每题所给的A、B、C、D中,选出最佳选项,并在答题卡上将该项涂黑。

Learning new words is learning new ideas: High school students can take control of their

learning by always looking up new words and finding out what they mean. They should keep a dictionary and a thesaurus close at hand.

Make clear lists: Students should make a list of everything that they need to get done. They should check off assignments (作业)once completed. They should include clear due dates.

Make a commitment: Active learners will resolve to keep up –to-date from the start. They will avoid procrastinating (delay doing something). They will complete most of their work as early as possible.

Independent work is best: Students will so all assignments independently—they will never copy! Students who copy are passive learners. Passive learners do not give their mind a chance to think on its own.

Organization is key: Students should keep an excellent folder and notebook. All problems should be clearly stated and solutions given. All tests and quizzes should be corrected and used as study guides for exams and finals.

All actions without solutions are dead: Active learners will always show their work needed to solve a problem. Active learners will never turn in a list of answers without giving an explanation or a solution.

Advanced reading: Students should do any required reading for the topic before class. They should write an outline of the section or chapter. They should actively take notes as they read to help them remember.

56.If you want to be successful in exams and finals you should ________.

A.give your mind a chance to think on its own

B.check off your papers once completed

C.keep an excellent folder and notebook

D.hand in your homework on time

57.If you want to be an active learner you________.

A.shouldn’t copy others assignments

B.shouldn’t write an outline before class

C.needn’t correct mistakes in the tests

D.needn’t kept a dictionary at hand

58.The best title of the passage is “________”.

A.How to Be an Effective Reader      B.How to Get Good Scores in Tests

C.How to Collect Academic Information   D.How to Actively Study in High School

单项选择题