of the two skirts satisfied Mary, so she asked __________to be shown A. None; the other B. Neither; the other C. Ne
可用于鉴别乙酸和乙醇的是（ ） A．NaCl溶液B．KNO3溶液C．Na2CO3溶液D．紫色石蕊试液
由n个碱基组成的基因，控制合成由1条多肽链组成的蛋白质，氨基酸的平均分子量为a，则该蛋白质的分子量最大为（） A． B． ﹣18（
- In a text message, 88 means Bye-bye. - And another example is F2F______ stands for face to face. A. that B. who C. whom D. it
汽车从甲地由静止出发，沿平直的公路开到乙地刚好停止运动，其速度图象如图所示，在0-t1和t1-3 t1两段时间内，汽车的（ ）A．加速度大小之比为
氨水有下列平衡：NH3·H2O NH4+ + OH– 当其它条件不变时，改变下列条件，平衡向左移动，且c(NH4+)增大的是 A．加NaOH B．加盐酸 C．加NH4Cl
One day I took a bus with my girlfriend. It was so 41 that we stood for several stops until a vacant(空闲的) seat was 42 for her. Then a pretty girl rushed towards me, saying, Hi, where a
语法与情景会话 Last Sunday we didn’t go out __________ the rain. A. because B. because of C. in front of D. before
，
于
，
交
于
，已知
，则
是
