--Look! It ________ be the new woman manager． -It ________ be her．She has just left for Shanghai． A．can; mustn't B．must; can't C．must; mustn't
The boy is only five years old, but he is quite used the telephone. A. to answer B. to answering C. of answering D. by answering
___________ a fine day, Shenzhou VI will be launched on time according to its planned time. A. Being B. It being C. To be D. It is
在真空密闭容器中盛有1 mol PCl5加热到200℃时发生的如下反应： PCl5（气）PCl3（气） +Cl2（气），反应达平衡后，PCl5所占体积分数为M%。若在同一温度和
I was giving a talk to a large group of people，the same talk I to half a dozen other groups. A.was giving B.am giving C.had
阅读下面的文字，完成6~9题。瘦素：关键的能量调控分子几乎人体内的所有生理过程都受大脑的监控和影响，因此我们可以推测，大脑可能通过影响食
下列均为相对性状的一组是 ①头发左旋与惯用右手②双眼皮与色盲③能卷舌和不能卷舌④卷发与黑发⑤有 耳垂和无耳垂⑥单眼皮和双眼皮
关于碱金属的性质叙述错误的是（ ） A．还原性随原子电子层数的增加而增加 B．在空气中燃烧的生成物都是过氧化物 C．与水反应的剧烈程度随核电荷
，
，则
.
解析: