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问题 单项选择题

在相同浓度的下列溶液中逐滴加入AgNO3溶液，最先生成沉淀的是（）。

Ksp,AgCl=1.56×10-5；Ksp,AgBr=7.7×10-13

Ksp,Agl=1.5×10-16；Ksp,Ag2CrO4=9×10-12

A．KCl溶液

B．KBr溶液

C．KI溶液

D．K2CrO4溶液

答案

参考答案：C

填空题
用方框内所给词的正确形式填空。
eye   in   watch   second   make   for   and   suitable   relax   be
    I think watching too much TV is not good for students. First,children 1            different from adults. It
is true that students like 2            by watching TV. However, the dangerous thing 3            students is that
they just can't take their 4            off the screen. They will go on watching TV for hours 5            hours.
It is very bad for their eyes. 6           , many students have a habit of 7            too much TV. Then they have
little time left for sports. Third, some TV programs are not 8            for students. Some even lead them to
commit crmes (犯罪). Finally, too much TV can 9            students weak in reading. They will lose interest
10            reading, which I think is a terrible thing.
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选择题

以下赋税制度中，表明封建国家对农民人身控制减轻的有 （   ） 

①租庸调制  ②两税法 ③募役法   ④一条鞭法 

A．①②

B．②③④

C．②④

D．①②④
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