1 将锌片和铜片用导线连接置于同一稀硫酸溶液中,下列说法正确的是

1 将锌片和铜片用导线连接置于同一稀硫酸溶液中,下列说法正确的是
A 正极附近 硫酸根 的浓度逐渐增大
B 负极附近 硫酸根 的浓度逐渐减小
C 负极附近 硫酸根 的浓度逐渐增到
D 正负极附近的硫酸根的浓度基本不变
2 铅蓄电池的两极分别为Pb PbO2,电解液为H2SO4,工作时反应为
Pb+PbO2+2 H2SO4=2PbSO4+2H2O 下列结论正确的是
A Pb为正极被氧化 B 溶液pH值不断减小 C 硫酸根只向PbO2处移动
D 电解液的密度不断减小
英语
1 Good morning,can I help you?
I`d like to have this package____,madam.
A be weighed B to be weighed C to weigh D weighed
2 The chair looks rather hard,but in fact it is bery comfortable to_____
A sit B sit on C be sat D be sat on
3 Most of the artists_____to the party were from South Africa
A invited B to be invited C being invited D had been invited
4 _____more attention,the trees could have grown better
A given B to give C giving D having given
5 Mr Smith warned her daughter_____after drinking.
A never to drive B to never drive C never driving D never drive
6 The secretary worked late into the night,_____a long speech for the president.
A to prepare B preparing C prepared D was preparing
7 I can hardly imagine the great trouble they will have to take_____their war-struck country.
A rebuiding B rebuid C to rebuild D rebuilt
8 The strong wind cause the fire,which apparently had beenset by somebody,_____quikly across the field.
A to spread B spread C spreading D to spreadong
哈哈 终于打完了 好累啊
请解答的同时

哈哈,楼主又见面了.这次怎么没有物理呢?
化学
1 将锌片和铜片用导线连接置于同一稀硫酸溶液中,下列说法正确的是
A 正极附近 硫酸根 的浓度逐渐增大
B 负极附近 硫酸根 的浓度逐渐减小
C 负极附近 硫酸根 的浓度逐渐增到
D 正负极附近的硫酸根的浓度基本不变
选D.楼主可能认为,原电池不是阴离子向负极移动吗,为什么硫酸根浓度又不变了?这个我也解释不清楚.但是事实是原电池可以一直工作,也就是说硫酸根会一直向负极移动,而溶液中硫酸根有限,说明了其实正负极硫酸根浓度应该是差不多才对.可能是因为离子是会做无规则运动的缘故吧.那些到达负极的硫酸根不会停在那里,而是跑掉了.
2 铅蓄电池的两极分别为Pb PbO2,电解液为H2SO4,工作时反应为
Pb+PbO2+2 H2SO4=2PbSO4+2H2O 下列结论正确的是
A Pb为正极被氧化 B 溶液pH值不断减小 C 硫酸根只向PbO2处移动
D 电解液的密度不断减小
选D.Pb失电子,为负极,被氧化,硫酸根会向Pb处移动,故AC错
H2SO4被反应掉了,H+浓度减小,pH就增大喽
电解液是H2SO4,被反应掉了,密度较小（它说的是电解液而不是溶液）
英语
1 Good morning,can I help you?
I`d like to have this package____,madam.
A be weighed B to be weighed C to weigh D weighed
选D.have sth to do是某人要做某事
have sth done是请别人做某事
2 The chair looks rather hard,but in fact it is bery comfortable to_____
A sit B sit on C be sat D be sat on
选B.it is + 形容词 + to do用主动表被动
不是sit the chair而是sit on the chair
3 Most of the artists_____to the party were from South Africa
A invited B to be invited C being invited D had been invited
选A.艺术家是被邀请的,而且这里需要的是非谓语（已有谓语were）,邀请的动作已完成,综上选过去分词invited
4 _____more attention,the trees could have grown better
A given B to give C giving D having given
选A.这里的trees是被注意的,只有A是被动
不过我总觉得这个句子怪怪的,它是虚拟语气啊,好像用Had they been given比较顺口
5 Mr Smith warned her daughter_____after drinking.
A never to drive B to never drive C never driving D never drive
选A.warn sb (not) to do 否定在不定式前
6 The secretary worked late into the night,_____a long speech for the president.
A to prepare B preparing C prepared D was preparing
选B,当伴随状语,表示“整晚为了总统准备着长长的演讲”
7 I can hardly imagine the great trouble they will have to take_____their war-struck country.
A rebuiding B rebuid C to rebuild D rebuilt
选C.take the (great) trouble to do sth.[费]尽力地做某事
have (some/little/no/much/great) trouble (in) doing sth.做某事遇到...麻烦
8 The strong wind cause the fire,which apparently had been set by somebody,_____quikly across the field.
A to spread B spread C spreading D to spreadong
选A,cause sth to do.