问题 选择题

物体做匀加速直线运动,已知加速度为2 m/s2,则

A.物体在某秒末的速度一定是该秒初的速度的2倍

B.物体在某秒末的速度一定比该秒初的速度大2 m/s

C.物体在某秒初的速度一定比前秒末的速度大2 m/s

D.物体在某秒末的速度一定比前秒初的速度大2 m/s

答案

答案:B

题目分析:物体在某秒末的速度一定比该秒初的速度大2m/s,A错误,B正确;某秒初和前秒末是同一时刻速度相等,C错误;某秒末与前秒初两时刻间的时间间隔是2s,速度应差4m/s,D错误。

完形填空
Exam anxiety is something that almost every person experiences during his or her student life. Little anxiety actually helps one      and work hard for the exams. However, if students spend all their time in feeling     , a lot of valuable study time would be lost.
In this competitive world,      cause a lot of nervousness in students. For some, exam anxiety encourages them to work hard, while for others it may be the root cause for poor performance, leading to academic      and lack of confidence. In fact, some students are anxious by nature and easily get nervous when they face a(n)     situation. They will think      even if they have prepared well. They fear that they may        what they have studied, and when it is too much, their      is likely to come true.
One of the most important methods of      exam anxiety is to prepare well in advance. Studying regularly for a few hours every day helps increase the      of students. If students are not able to handle anxiety or nervousness, they could talk to their teachers, parents, friends or instructors.      should also avoid giving pressure to their kids to do well. Creating a peaceful and      atmosphere at home can be greatly helpful.
To      and sleep properly is also important. Students tend to avoid sleep and starve themselves due to anxiety, but it is      to their academic performance and health. It’s better that students should plan their time well and take proper breaks between studies. They should always remember to set aside some time for their      since some entertainment helps them relax and concentrate.
小题1:
A.concentrateB.relaxC.succeedD.experience
小题2:
A.curiousB.confidentC.anxiousD.calm
小题3:
A.plansB.breaksC.jobsD.exams
小题4:
A.failureB.achievementC.preparationD.performance
小题5:
A.peacefulB.stressfulC.naturalD.avoidable
小题6:
A.positivelyB.confidentlyC.intentionallyD.negatively
小题7:
A.rememberB.forgetC.confuseD.lose
小题8:
A.fearB.dreamC.expectationD.competition
小题9:
A.increasingB.feelingC.avoidingD.creating
小题10:
A.relaxationB.pressureC.nervousnessD.confidence
小题11:
A.TeachersB.ParentsC.FriendsD.Instructors
小题12:
A.relaxingB.excitingC.depressingD.worrying
小题13:
A.learnB.playC.restD.eat
小题14:
A.helpfulB.harmfulC.importantD.nice
小题15:
A.studiesB.habitsC.hobbiesD.meals
单项选择题