—Where is kate?
—She _____ in her room. [ ]
A. read
B. reads
C. is read
D. is reading
答案:D
据报道,一辆轿车高速强行超车时,与迎面驶来的另一辆轿车相撞。两车身因碰撞挤压,皆缩短了约0.5 m,根据测算相撞时两车车速均约为109 km/h,试求碰撞过程中车内质量是60 kg的人受到的平均冲击力约为多少?
谈谈中国外交的机遇和挑战是什么?