从疾病的预防策略角度看，流行病学普查和筛检属于A．一级预防 B．二级预防 C．三级预

按照企业所得税的有关规定，下列各项表述正确的有( )。

A．事业单位的固定资产变卖收入，不计入应纳税所得额

B．企业收取的包装物押金，凡逾期未返还买方的，应确认为收入

C．企业在建工程发生的试运行收入，应冲减在建工程成本

D．企业向有长期固定购销关系的客户收取的可循环使用包装物的押金，其收取的合理的押金在循环期间不作为收入

—Which of the twins jump _________?

—It's hard to say. Now their scores are the same. [ ]

A. far

B. farther

C. farthest

直流电动机耐压试验的目的是考核（）。

A、导电部分的对地绝缘强度

B、导电部分之间的绝缘强度

C、导电部分对地绝缘电阻大小

D、导电部分所耐电压的高低

People have smoked cigarettes for a long time now. The tobacco which is used to make cigarettes was first grown in what is now part of the United States. Christopher Columbus, who discovered America, saw the Indians smoking. Soon the dried leaves were transported to Europe . In the late 1800s, the Turks made cigarettes popular.

Cigarette smoke contains at least two harmful substances, tar and nicotine. Tar, which forms as the tobacco burns, damages the lungs and therefore affects breathing. Nicotine, which is found in the leaves, causes the heart to beat faster and increases the breathing rate. Nicotine in large can kill a person by stopping a person’s breathing muscles. Smokers usually take in small amounts that the body can quickly break down.

Nicotine can make new smokers feel dizzy(头晕) or sick to their stomachs. The heart rate for young smokers increases 2 to 3 beats per minute. Nicotine also lowers skin temperature and reduces blood flow in the legs and feet. It plays an important role in increasing smokers’ risk of heart disease and stroke.

Smoking cigarettes is dangerous. Cigarette smoking was the cause of lung cancer and several other deadly diseases.

小题1:.

Tobacco first appeared in_________.

A．Asia

B．Africa

C．Europe

D．America小题2:.

What is the main purpose of the first paragraph?

A．To tell us the bad effects caused by smoking cigarettes

B．To introduce the history of smoking

C．To let us know what the cigarettes are made from

D．To tell the readers that Columbus found the Indians smoking小题3:.

._________doesn’t make one’s heart beat as usual.

A．Tar

B．Nicotine

C．Lung disease

D．Leave小题4:.

The following effects are caused by Nicotine EXCEPT that________.

A．It can make new smokers feel dizzy or sick to their stomachs

B．It lowers skin temperature

C．It causes the heart to beat less fast

D．Nicotine will probably kill a person if a smoker takes in too much of it.小题5:.

What’s the main idea of this passage?

A．Where did cigarettes come from?

B．The effect of smoking on your body.

C．How to smoke is healthy?

D．Who is the first smoker?

Ⅱ类设备有什么特点。