某高层饭店使用液化石油气作为燃料，共8瓶50kg级钢瓶串连供气（112升/瓶）。 问

某中学门口因小摊贩设摊，引起交通堵塞。在城管执法过程中，摊贩与城管时常发生冲突。针对这一现象，该校部分学生成立探究性学习小组，进行相关调查。一些同学进行实地采访：

城管人员认为：小摊贩无证经营，到处乱摆摊，造成交通堵塞，严重影响市容。

小贩大吐苦水：办证谁不想啊？可我们是小本经营，赚的钱刚够糊口，摊位租金又贵，只得在马路上跑（采访中，学生发现小摊贩大多是下岗人员和外来务工人员）。

顾客认为：小摊贩设点灵活方便且价格便宜。

运用《经济生活》的有关知识，说明小摊贩经营活动存在的原因。

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患者，女，15岁，反复关节红肿疼痛，双下肢有小出血点，1个月以后，尿中红细胞6～10个／高倍视野，蛋白（+），血压160／100mmHg，血小板20万，血抗核抗体阴性。

其治疗为（）

A.高血压药物治疗

B.消炎痛药物治疗

C.止血药首选

D.对症治疗及免疫抑制药联合治疗

E.利尿药物治疗

When permits for the discharge of chemicals into a waterway are issued, they are issued in terms of the number of pounds of each chemical that can be discharged into the waterway per day. These figures, calculated separately for each chemical for which a permit is issued, are based on an estimate of the effect of the dilution of the chemical by the amount of water flowing through the waterway. The waterway is therefore protected against being adversely affected by chemicals discharged under the permits.
The argument depends on the assumption that

A．relatively harmless chemicals do not interact with each other in the water to form harmful compounds.

B．there is a swift flow of water in the waterway that ensures rapid dispersion of chemicals discharged.

C．there are no chemicals for which discharge into waterways is entirely prohibited.

D．those who receive the permits do not always discharge the entire quantity of chemicals that the permits allow.

E．(E) the danger of chemical pollution of waterways is to be evaluated in terms of human health only and not in terms of the health of both human beings and wildlife.

个人计算机通过电话线接入Internet，必须安装的硬件是【 】。

2008年奥运会是在（）国家举办的奥运会。

A.人口最多

B.经济发展速度最快

C.最大的发展中

D.经济最发达