下列加下划线字的注音完全正确的一项是（    ）

填人下面一段文字横线处的语句，最恰当的一句是（   ）

    职责的转变与业务量的增加使得对消防员的要求也越来越高，             。新兵从一个地方青年到一个合格的消防战斗员，通过训练和实战需要半年到一年左右的时间。除了理论知识的学习，体能的训练，心理素质也是极为重要的一项课程。后期实战也会让新人真正深入到各种突发灾害中，让其心理素质和胆量在训练和实战中得到强化。

用分数表示下面各式的商．

吊车以2m/s的速度将重物1×10⁵N匀速向上提起，这时钢索对重物的拉力 ____ N；若钢索改为以3m/s的速度使重物匀速下降，此时钢索对重物的拉力大小是____N。

    One day a farmer’s donkey fell down into a well. The animal cried 1 for hours as the farmer tried to figure out 2 to do. Finally he decided the animal was 3and the well needed to be 4 up anyway, so it just wasn’t 5 it to rescue the donkey.

    He invited all his 6to come over and help him. They all grabbed (握起) a shovel (铁铲) and began to shovel 7into the well. At first, the donkey 8what was happening and cried horribly. Then, to everyone’s9, he was quiet.

    A few shovel loads later, the farmer looked 10 the well and was 11 at what he saw. With every shovel of dirt that12his back, the donkey was doing something amazing. He would 13 it off and take a step up. As the farmer’s neighbors 14 to shovel dirt on top of the animal, he would shake it off and take another 15 up. Pretty soon, everyone was surprised as the donkey stepped up over the 16 of the well and ran off.

    Life is going to shovel dirt on you, all kinds of dirt. The best way of 17 out of the well is to shake it off and take a step up. Each of our18is a stepping-stone. We can get out of the deepest 19 just by not stopping, never20! Shake it off and take a step upward!