下列一组等高线判读正确的是 A．山脊 B．山地 C．鞍部 D．山脊
--How about your journey to Mount Emei? --Everything was wonderful except that our car _________ twice on the way． A．slowed down B．broke down C．got down
我国计划于2022年建成并投人使用太空空间站。目前空间站内的氧气主要是通过电解水方式获得,然后将氧气与储备的氮气以一定体积比混合成“人造空气
I think the doctor is able to care of _____ is the matter with your son . A. all B. what C. whatever D. anything
That art centre is ____ used to be a factory , ______millions of cars were made. A. what ; where B. where; where C. what; which D. where; which
许多生产企业在自己产品的外包装袋上印有“建议零售价”，但各地市场上实际零售价都与之有较大的差距，这是因为“建议零售价” A.不能及时反映
