妊娠合并急性阑尾炎术中哪项说法不正确A．妊娠中晚期采取麦氏切口 B．采取左侧卧位以便

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.

不能发生铝热反应的是                                   （   ）

A．V₂O₅

B．Cr₂O₃

C．MnO₂

D．MgO

神经梅毒通常发生在梅毒的（）

A.Ⅰ期

B.Ⅲ期

C.Ⅱ期

D.以上均是

E.以上均不是

室内给水管道水力计算的目的是确定给水系统中的（）统所需压力。

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