读甲、乙两省轮廓图，完成问题。 下列关于R1河段与R2河段的叙述，正确的是 A．均为“地上河”
下列加点成语使用错误的一项是：（ ） A．在人民群众的利益受到危害的紧要关头，有极少数干部，或无动于衷，或畏葸不前，其所作所为，与共&#
—It’s wrong for a student to follow his teachers say. —It’s true.I can’t agree. A.whatever;more B.no matter what;more C.whatever;much D.no matter what;much
把一小球从离地面h=5m处，以v=10m/s的初速度水平抛出，不计空气阻力， （g=10m/s2）。求：（1）小球在空中飞行的时间 （2）小球落地点离抛出点的水
—Excuse me, where is Mr Brown’s office? —Sorry, I don’t know. I ______ here for only a few days. A. work B. worked C. have worked
They plan to _______ a food bank to help homeless people. A. set off B. set out C. set in D. set up
下列有关实验的描述中，正确的是 ①钠放入水中后，沉在水下缓缓冒出气体 ②Na2CO3和NaHCO3的溶液都可以使无色酚酞试液变红 ③氢气在氧气或氯气中燃
—Few children are as bright as he is，and also，he works very hard. —It’s no_________he always wins first place in every examination. A.doubt
为异面直线，直线c∥a，则c与b的位置关系是 