简述摩羯座的由来。

Students Begin to Smoke at a Younger Age

SHANGHAI---- Almost one in four students aged between 12 and 14 have tried smoking, according to the results of a survey from the CATC(中国抗癌协会).

“ Quite a number of boy students in my class smoke outside the school yard during lunch break,” said Li Xiaolan, an English teacher from a high school in Shanghai.

The survey also found that 39 percent of students took their first cigarette from their classmates.

“ It was quite common to smoke with my classmates at school,”said Zhou Guangrong,a 22- year–old university student from Guiyang, Guizhou province,who started smoking at the age of 12.

Most of the student smokers buy cigarettes themselves.” My middle and high schools were surrounded by cigarette shops when I was a student,” said Liu Minghui who used to smoke two cigarettes per day in primary school and two packs per week in middle and high school.

“ We’re keen to show that more teenagers are starting smoking much younger than before,and that we need to minimize(降低) the number of young smokers,” said Duan Jiali, an officer in CATC. He added that teachers and parents should set a good example for teenagers by not smoking in front of them at school or at home, which is the best way of stopping teenagers from smoking.

小题1:According to the survey,in a middle school if a class has 40 students, about _____ smoke.

A．5

B．10

C．15

D．20小题2:Many boy students smoke ________during lunch break.

A．at home

B．in class

C．in the office

D．outside the school yard小题3:The survey found that 39 percent of students took their first cigarette from ________.

A．their parents

B．their teachers

C．their brothers

D．their classmates小题4:From the passage we know ________smokes two packs per week in middle and high school.

A．LI Xiaolan

B．Zhou Guangrong

C．Liu Minghui

D．Duan Jiali小题5:Which of the following is NOT true according to the passage?

A．More teenagers are starting smoking much older than before.

B．Most of student smokers buy cigarettes themselves.

C．Some students smoke in toilets or in corners of the playground after lunch.

D．Teachers and parents shouldn’t smoke.

（14分）

I．常温下浓度均为0.l mol/L的下列溶液：①Na₂CO₃溶液②NaHCO₃溶液③盐酸④氨水

回答下列问题。

（1）上述溶液中有水解反应发生的是      （填编号，下同），溶液中溶质存在电离平衡的是         。

（2）四种溶液中对水的电离抑制作用最大的是   ；比较①、②溶液，pH较大的是  。

（3）在溶液④中加入NH₄Cl固体，NH⁺₄浓度与OH^-浓度的比值将____（填“变大”、“变小”、“不变”）

II．有一瓶无色澄清溶渡，其中可能含有：NH⁺₄、K⁺、Mg²⁺、Al³⁺、Fe²⁺、NO^-₃、Cl^-、SO^2-₄、CO^2-₃取该溶液进行下列实验：

（1）取部分溶液，向其中逐滴滇入Ba（OH）₂溶液至过量，有白色沉淀生成，沉淀量与加入Ba（OH）₂溶液量的关系如右图所示。

（2）取（I）反应后过滤所得沉淀和滤液，在沉淀中加入稀盐酸后，沉淀不减少。将滤液分为两等份，一份加热，未产生刺激性气味的气体；另一份如HNO₃酸化时有白色沉淀产生，继续加HNO₃，沉淀又消失，再加AgNO₃没有变化。

根据以上事实确定：该溶液中肯定存在的离子有            ；

肯定不存在的离子有____   。

下列处理哪项较为妥当

A．给予度冷丁止痛

B．给予口服植物油

C．给予空气灌肠

D．按急诊作术前准备

E．胃肠减压同时氧气驱虫

毛 * * 在《论十大关系》中认为，中国工业化道路中最重要的问题就是重工业、轻工业和农业的发展关系问题。

道德感、理智感、美感是人们在社会生活条件下对——的反映，并且还调节着人的社会性行为（）

A.社会需求

B.生理需要

C.态度

D.体验