下列化肥中属于氮肥的是[ ] A.K2SO4 B.CO(NH2)2 C.KCl

2013年3月5日，国务院 * * 温 * * 在十二届全国人大一次会议上作政府工作报告时指出，五年累计，共淘汰落后炼铁产能1.17亿吨、炼钢产能7800万吨、水泥产能7.75亿吨；新增城市污水日处理能力4600万吨；单位国内生产总值能耗下降17.2%，化学需氧量、二氧化硫排放总量分别下降15.7%和17.5%。这些做法体现的基本国策是（）

A．节能减排

B．节约资源和保护环境

C．依法治国

D．可持续发展

仔细阅读下面的短文并按要求完成后面的小题。

It is said that about half of the people in China smoke. Many young boys and girls have the habit of smoking, though they are middle school students.

More and more people have come to realize how serious this problem is. But they are never bored with it. ?Some people think it is a kind of fashion, some think it is of great fun and others think that smoking can refresh themselves.

Smoking causes many illnesses. A lot of people always cough ?             smoking. The most serious illness caused by smoking is lung cancer. At the same time smoking is a waste of money. Besides, careless smokers may cause dangerous firs.

?众所周知，吸烟有害于人体健康。In order to keep healthy, we should get rid of the bad habit of smoking. Please stop smoking at once.

1. 将?句划线部分译成汉语：                                               

2.在?句的空白处填入适当的词使句意完整、上下文通顺：              

3.将?句划线部分的汉语译成英语：                                        

4.列出短文中提到的吸烟的至少两点危害：                                  

5.该篇短文的主题是：                                                    

管理具备五个方面的特征，下列( )项不属于其特征。

A．动态性

B．科学性

C．艺术性

D．整体性

样本含量足够大，总体阳性率与阴性率均不接近于0和1，总体率95%可信区间的估计公式为（）

A．P±2.58Sp

B．P±1.96Sp

C．P±1.9

D．P±2.58

E．P±1.96

下列哪个元素属于微量元素（）

A、钙

B、磷

C、钾

D、硒