不等式3（x-1）≥5x-3的自然数解是______．

某公司计划用两年的时间把某种型号的电脑成本降低19％，若每年下降的百分数相同。求这个百分数。

阅读在线      

       楚王知道晏子身材矮小，就叫人在城门旁边开了一个五尺来高的洞。晏子来到楚国，楚王叫人把城门关了，让晏子从这个洞进去。晏子看了看，对接待的人说：“这是个狗洞，不是城门。只有访问‘狗国’才从狗洞进去。我在这儿等一会儿。你们先去问个明白，楚国到底是个什么样的国家？”接待的人立刻把晏子的话传给了楚王。楚王只好吩咐大开城门，迎接晏子。 

1．晏子的身材特点是什么？

2．楚王是如何侮辱晏子的？

3．晏子是如何对待的？ 

4．这个小故事表现了什么？  

下列关于胶体的叙述不正确的是 [ ]

A．胶体分散质颗粒的直径在1nm～100nm之间     

B．向胶体中加入蔗糖溶液，产生聚沉现象     

C．一束可见光透过胶体时，发生丁达尔现象     

D．采用渗析的方法可以净化胶体

Obama Still Smokes in Secret

US President Barack Obama has just made life more difficult for cigarette makers. He has just signed a law that will set tough new rules for the tobacco industry. The new law gives the US Food and Drug Administration the power to strictly limit the making and marketing of tobacco products.

At a White House signing ceremony Monday, Obama said that he was among the nearly 90% of smokers who took up the habit before their 18 th birthday.

Obama, who has publicly struggled to give up smoking, said he still hadn’t completely kicked the habit. Every now and then he still smokes in secret.

“As a former smoker I struggle with it all the time. Do I still smoke sometimes? Yes. Am I a daily smoker, a constant smoker? No.” Obama said at a news conference.

“I don' t do it in front of my lads．I don ?t do it in front of my family．I would say that I am 95% cured, but there are times when I mess up, " he said．

"Once you go down this path, it' s something you continually struggle with, which is exactly why the law is so important．The new law is not about me, it' s about the next generation of kids coming up．What we don ' t want is kids going down that path," he said．

Nearly 20% of Americans smoke and tobacco use kills about 440,000 people a year in the United States due to cancer, heart disease, and other serious diseases．

小题1:The new law makes life difficult for             .

A．Obama

B．tobacco industry

C．White House

D．US Food and Drug Administration小题2:What do we know about Obama?

A．He no longer smokes．

B．He still smokes as usual．

C．He began to smoke at eighteen．

D．He is trying hard to give up smoking．小题3:According to the passage, Obama is most concerned about           ．

A．children

B．officials

C．his family

D．Businessmen

稀酸泵出口铵盐含量高，可能的原因是（）。

A.催化剂老化

B.氨氧化率低

C.氨转化率低

D.氨转化率高