题目

做匀加速直线运动的某物体从A运动到C所用时间是t，B是AC连线上的一点，已知物体在AB段的平均速度为v，在BC段的平均速度为3v，则该物体的加速度应当为（     ） A．2v/t    B．4v/t    C．2t/v    D．4t/v 答案：B动词填空 用括号内所给动词的适当形式填空，并将答案写在答题卷标有题号的横线上。 （本大题共10小题，每小题1分，共10分）1.Tim _____________ (make) three wishes before he blew out the candles on his birthday cake.2.The government _____________ (change) the areas around the TaiHu Lake into a beautiful park in the past three years.3.In the coming years， land _____________ (become) more and more expensive.4.Hospital uniforms may be green because the colour _______________ (relax) patients.5.Don’t keep the tap _____________ (run)! It’s a waste of water.6._____________ (save) energy， turn off the hot water after you take a shower.7.While I was watching a football match on TV， my twin brother _____________ (pack) for the next day’s trip to Qingdao.8. I like Jay Zhou’s songs， because they always make me _________ (feel) energetic(充满活力的).9. —When will he go to watch the basketball match in the sports centre?—Not until he _____________ (finish) his work.10.Nobody _____________ (get) any information about the accident. We are all worried.