Though the work is very hard, he doesn’t want to_______easily. A. give in B. give up C. give away D. give over 答案:B give up放弃。句意:尽管工作很难,但他不想轻易放弃。随着生活水平的提高,汽车已逐渐进入家庭,但我们在享受汽车给我们带来方便的同时,千万不要忽视交通安全.设汽车的速度为90 km/h,汽车轮胎与地面间的动摩擦因数为0.8,取g=10 m/s2,若要汽车在紧急刹车后3—4 s内即可停下来,试计算它大约滑出了多远( ) A.10 m B.20 m C.30 m D.40 m