— Who is singing in the next room?

— It        be Lucy. She likes singing at this time.

如图，倾角为α的斜面体放在粗糙的水平面上，质量为m的物体A与一劲度系数为k的轻弹簧相连．现用拉力F沿斜面向上拉弹簧，使物体A在粗糙斜面上匀速上滑，上滑的高度为h，斜面体始终处于静止状态．在这一过程中（   ）

B) 根据语境，从方框中选择恰当的单词填空，并将正确答案填在短文后的横线上。

    To improve your English reading, you should, first of all, choose something you feel important or____ to read. Don't try to read everything. You should____ those written in easy English. Don't read those which is difficult for you at the very beginning.

    While reading, don't read too slowly or look up every new word you meet with. After reading a passage and having its main idea in mind, you may____ and read it again. This time you can read it slowly and look up some new words ____ necessary.

    Keep on reading in this way and you'll surely make____ little by little.