D
Ecigarettes look hightech，so it’s easy to believe that they’re safe to smoke. Unfortunately，they’re not：Ecigarettes are just another way of putting nicotine into your body.
Electronic cigarettes are smoking devices often designed to look and feel like regular cigarettes. They are filled with a liquid that contains nicotine，flavorings，and other chemicals. A heating device in the ecigarette changes the liquid into a vapor (烟雾) the person breathes in.
Because ecigarettes don’t burn tobacco，people don’t breathe in the same amount of carbon monoxide as they would with a regular cigarette. But anyone using an ecigarettes still gets an amount of nicotine and other chemicals.
Electronic cigarettes started out being marketed to smokers as a way to help them quit. Now ecigarettes have been mainstreamed. Scientists expect to see more information coming out about ecigarettes and their health effects.
Ecigarettes don’t fill the lungs with harmful smoke，but that doesn’t make them a healthy alternative to regular cigarettes. When you use an ecigarette，you’re still putting nicotine—which is absorbed through your lungs—into your system. In addition to being an addictive drug，researchers at the University of Utah used some animals to conduct a study to prove the toxic effects of nicotine. Later it was once even used as a chemical drug to kill some insects in agriculture.
Nicotine affects your brain，nervous system，and heart. It raises the blood pressure and the heart rate. The larger an amount of nicotine，the more a person’s blood pressure and heart rate go up. This can cause an arrhythmia(心律失常)．In rare cases，especially when large amounts of nicotine are involved，arrhythmias can cause heart failure and death.
After its first effects disappear gradually，the body starts to desire nicotine.You might feel depressed or tired，and want more nicotine to feel lively again.Over time，nicotine use can lead to serious medical problems，including heart disease，blood clots，and stomach diseases.
32．The underlined word“toxic” in Paragraph 5 is closest in meaning to ________.
A．safe B．poisonous
C．beneficial D．curable
33．Why did electronic cigarettes come into being?
A．Because it was designed to help smokers give up smoking.
B．Because smokers meant to have a taste of new products.
C．Because the device turned out to be practical for smokers.
D．Because it is convenient for smokers to carry.
34．When using an ecigarette，________.
A．you will find it cool
B．you will save a lot of money
C．you will avoid damaging your body
D．you will take nicotine into lungs
35．What does the sixth paragraph mainly talk about?
A．The harm of nicotine.
B．What nicotine is.
C．How arrhythmias form.
D．The functions of nicotine.
D答案： 32．B 33．A 34．D 35．A
Ecigarettes look hightech，so it’s easy to believe that they’re safe to smoke. Unfortunately，they’re not：Ecigarettes are just another way of putting nicotine into your body.
Electronic cigarettes are smoking devices often designed to look and feel like regular cigarettes. They are filled with a liquid that contains nicotine，flavorings，and other chemicals. A heating device in the ecigarette changes the liquid into a vapor (烟雾) the person breathes in.
Because ecigarettes don’t burn tobacco，people don’t breathe in the same amount of carbon monoxide as they would with a regular cigarette. But anyone using an ecigarettes still gets an amount of nicotine and other chemicals.
Electronic cigarettes started out being marketed to smokers as a way to help them quit. Now ecigarettes have been mainstreamed. Scientists expect to see more information coming out about ecigarettes and their health effects.
Ecigarettes don’t fill the lungs with harmful smoke，but that doesn’t make them a healthy alternative to regular cigarettes. When you use an ecigarette，you’re still putting nicotine—which is absorbed through your lungs—into your system. In addition to being an addictive drug，researchers at the University of Utah used some animals to conduct a study to prove the toxic effects of nicotine. Later it was once even used as a chemical drug to kill some insects in agriculture.
Nicotine affects your brain，nervous system，and heart. It raises the blood pressure and the heart rate. The larger an amount of nicotine，the more a person’s blood pressure and heart rate go up. This can cause an arrhythmia(心律失常)．In rare cases，especially when large amounts of nicotine are involved，arrhythmias can cause heart failure and death.
After its first effects disappear gradually，the body starts to desire nicotine.You might feel depressed or tired，and want more nicotine to feel lively again.Over time，nicotine use can lead to serious medical problems，including heart disease，blood clots，and stomach diseases.
32．The underlined word“toxic” in Paragraph 5 is closest in meaning to ________.
A．safe B．poisonous
C．beneficial D．curable
33．Why did electronic cigarettes come into being?
A．Because it was designed to help smokers give up smoking.
B．Because smokers meant to have a taste of new products.
C．Because the device turned out to be practical for smokers.
D．Because it is convenient for smokers to carry.
34．When using an ecigarette，________.
A．you will find it cool
B．you will save a lot of money
C．you will avoid damaging your body
D．you will take nicotine into lungs
35．What does the sixth paragraph mainly talk about?
A．The harm of nicotine.
B．What nicotine is.
C．How arrhythmias form.
D．The functions of nicotine.
D答案： 32．B 33．A 34．D 35．A
