题目

可逆反应H2(g)+I2(g)  2HI(g)  H＜0， 达到平衡后，当改变外界条件如物质浓度、体系压强等而发生下列项目的变化时，能做为平衡一定发生了移动的标志的是（   ）                                                                     A．气体的密度变小了     B．反应物和生成物浓度均变为原来的2倍     C．气体的颜色变深了     D．体系的温度发生了变化根据首字母或汉语提示完成句子【1】Tom is from the US, but now he __________(居住)in Beijing.【2】(中考滨州)There are nearly four __________(百)students in our school.【3】Hurry up! We have few __________(分钟)left.【4】There are lots of cars and b________ at the station.【5】My home isn't f________from the school. It is only ten minutes' walk.