题型:判断题 — Are two students enough to help you carry the desk?— No, the desk is too heavy. I need ______ two.A.other B.anotherC.the otherD.others 查看答案
题型:判断题 汽车以72千米/时的速度在公路上行驶,开向寂静的山谷,驾驶员揿一下喇叭,4秒后听到回响,这时汽车离山谷多远?已知空气中声音的传播速度约为340米/秒.设听到回响时,汽车离山谷x米,根据题意,列出方程为( )A.2x+4×20=4×340B.2x-4×72=4×340C.2x+4×72=4×340D.2x-4×20=4×340 查看答案