新经济政策和战时共产主义政策相比，主要“新”在 A．国家控制经济命脉 B．无产阶级掌握了国家政权 C．利用市场发展商品
下列生态系统中最稳定的是（ ） A．沙漠 B．水稻田 C．温带草原 D．热带雨林
I told you that you shouldn't waste your time playing the computer games,_____________? A. didn't I B. did I C. should you D. shouldn't you
阅读下面一首诗，完成小题。（4分）过松源晨炊漆公店杨万里莫言下岭便无难，赚得行人空喜欢。正入万山圈子里，一山放过一山拦。1.这首七言绝句
（16分） 如图所示，质量的物体与地面的动摩擦因数。物体在与地面成的恒力F作用下，由静止开始运动，运动0.20s撤去F，又经过040s物体刚好停下。
Lucy is believed to have been killed by a vampire. She was seen ________ Dracula’s castle last week and has never come out. A. enter B. to enter C.
如图，点E、F在BC上，BE＝CF，AB＝DC，∠B＝∠C． 求证：∠A＝∠D．
