下列做法不利于避免或减轻洪水造成损失的是（ ） A．长江中上游地区植树造林 B．长江中下游地区围湖造田 C．黄河下游加固江防大堤 D．三江
质量为M的物块以速度v运动，与质量为m的静止物块发生正碰，碰撞后两者的动量正好相等，则两者质量之比为M/m可能为
If you can look through the text before class，you will find it easy to __________ what the teacher teaches. A．take up B．take on C．take in
Each of the students, working hard at his or her lessons,___to go to university.” “So do I.”A. hope B. hopes C. hoping D. hoped
空气中含量较多且化学性质不活泼的气体是 （ ） A. 氧气 B. 二氧化碳 C. 氮气
I remember my first day here very clearly. My friend was waiting for me when my plane 21 at Kennedy Airport at 3 o’clock in the afternoon. The weather was very 22 and it was s
________, she passed the driving test. A. In short B. For short C. In vain D. In use
下图是两国家的轮廓图，读图完成以下各题。 （1）说出A处的农业地域类型及其突出特点。 （2）A图中五大湖地区 农业
