题目

关于做匀变速直线运动的物体,下列说法正确的是(    ) A．在1 s内、2 s内、3 s内物体通过的位移之比是1∶4∶9 B．一质点的位置坐标函数是x=2t+2t2，则它运动的初速度是2 m/s，加速度是4 m/s2 C．加速度方向不一定与速度方向相同，但一定与速度变化的方向相同 D．任意两个相等时间间隔内物体的位移之差都相等8．"The Chinese Dream"is a hot topic of this year．Many Chinese young people are inspired by the Chinese Dream．Everyone has their own dreams．They give us courage and confidence to keep us going through difficulties．Here are some advice on how to realize our beautiful dreams．  Never giving up is the key to make our dreams come true．We may fail from time to time，but we can learn from failure，correct our mistakes and try again until we achieve our goals．Our life is like a long journey which is not all roses． It sometimes has wind and rain．We believe rainbows will appear after storms．  Cooperation is also necessary．Everyone likes a person who is good at cooperating with others．Besides，in our society most problems can't be solved by one person alone．Cooperation is becoming one of the most important ways for people living in the developing society．  At the same time，we should learn to examine our abilities because it helps us know our advantages and disadvantages as well as get a full control of ourselves．Then we may be confident enough to face challenges．  Follow the suggestions above，and our dreams are sure to come true．25：The underlined word"It"in the second paragraph refers toBA．never giving up our dreams   B．our lifeC．a long journey               D．learning from failure26：Which is the best title for this passage？DA．The Chinese Dream      B．Cooperation is NecessaryC．Examine Our Abilities    D．Advice on How to Realize Our Beautiful Dreams．27．The underlined word"cooperation"meansDA．operation  B．confidence    C．courage  D．collaboration 28．Which of the following is true？D．A．Confidence is the key to make our dream come true．B．We can solve all the problems by ourselves．C．Hard work isn't necessary to achieve our goals．D．We should be brave to face challenges．