Breathing such polluted air is the _______ of smoking ten cigarettes a day.

The Dangers of Secondhand Smoke

Most people know that cigarette smoking is harmful to their health. Scientific research shows that it causes many kinds of diseases. In fact, many people who smoke get lung cancer. However, Edward Gilson has lung cancer, and he has never smoked cigarettes. He lives with his wife, Evelyn, who has smoked about a pack of cigarettes a day throughout their marriage.＿＿＿＿＿(46)

No one knows for sure why Mr. Gilson has lung cancer. Nevertheless, doctors

believe that secondhand smoke may cause lung cancer in people who do not smoke

because nonsmokers often breathe in the smoke from other people's cigarettes.

＿＿＿＿＿(47) The US Environmental Protection Agency reports that about 53,000

people die in the United States each year as a result of exposure to secondhand smoke.

The smoke that comes from a lit cigarette contains many different poisonous

chemicals. In the past, scientists did not think that these chemicals could harm a nonsmoker's health.＿＿＿＿(48) They discovered that even nonsmokers had

unhealthy amounts of these toxic (有毒的) chemicals in their bodies. As a matter of fact, almost all of us breathe tobacco smoke at times, whether we realize it or not. For example, we cannot avoid secondhand smoke in restaurants, hotels and other public places. Even though many public places have nonsmoking areas, smoke flows in from the areas where smoking is permitted.

It is even harder for children to avoid secondhand smoke.＿＿＿＿(49)

Research shows that children who are exposed to secondhand smoke are sick more often than children who live in homes where no one smokes and that the children of smokers are more than twice as likely to develop lung cancer when they are adults as are children of nonsmokers. The risk is even higher for children who live in homes where both parents smoke.

People are becoming very aware of the dangers of secondhand smoke.＿＿＿＿(5O){Page}

A．Recently, though, scientists changed their opinion after they studied a large group of "nonsmokers.

B．The Gilsons have been married for 35 years.

C．This smoke is called secondhand smoke.

D．However, secondhand smoke is dangerous to all people, old or young.

E．As a result, they have passed laws which prohibit people from smoking in many public places.

F．In the United States, nine million children under the age of five live in homes with at least one smoker.

第 46 题 请选择（46）处的最佳答案．

回答题。

The Dangers of Secondhand Smoke

Most people know that cigarette smoking is harmful to their health. Scientific research shows that it causes many kinds of diseases. In fact, many people who smoke get lung cancer. However, Edward Gilson has lung cancer, and he has never smoked cigarettes. He lives with his wife, Evelyn, who has smoked about a pack of cigarettes a day throughout their marriage. 46 No one knows for sure why Mr. Gilson has lung cancer

Nevertheless, doctors believe that secondhand smoke may cause lung cancer in people who do not smoke because nonsmokers often breathe in the smoke from other people&39;s cigarettes. 47 The US Environmental Protection Agency reports that about 53,000 people die in the United States each year as a result of exposure to secondhand smoke.

The smoke that comes from a lit cigarette contains many different poisonous chemicals. In the past, scientists did not think that these chemicals could harm a nonsmoker&39;s health. 48 They discovered that even nonsmokers had unhealthy amounts of these toxic ( 有毒的 ) chemicals in their bodies. As a matter of fact, almost all of us breathe tobacco smoke at times, whether we realize it or not. For example, we cannot avoid secondhand smoke in restaurants, hotels and other public places. Even though many public places have nonsmoking areas, smoke flows in from the areas where smoking is permitted.

It is even harder for children to avoid secondhand smoke. 49 Research shows that children who are exposed to secondhand smoke are sick more often than children who live in homes where no one smokes and that the children of smokers are more than twice as likely to develop lung cancer when they are adults as are children of nonsmokers. The risk is even higher for children who live in homes where both parents smoke.

People are becoming very aware of the dangers of secondhand smoke. 50

A. Recently, though, scientists changed their opinion after they studied a large group. of nonsmokers.

B. The Gilsons have been married for 35 years.

C. This smoke is called secondhand smoke.

D. However, secondhand smoke is dangerous to all people, old or young.

E. As a result, they have passed laws which prohibit people from smoking in many public places.

F. In the United States, nine million children under the age of five live in homes with at least one smoker.

请回答（46）__________ 查看材料

A.A

B.B

C.C

D.D

E.E

F.F

根据以下材料，回答题

The Dangers of Secondhand Smoke

Most people know that cigarette smoking is harmful to their health. Scientific research shows that it causes many kinds of diseases. In fact， many people who smoke get lung cancel. However，Edward Gilson has lung cancer， and he has never smoked cigarettes. He lives with his wife， Evelyn，who has smoked about a pack of cigarettes a day throughout their marriage. 46______

No one knows for sure why Mr. Gilson has lung cancer. Nevertheless， doctors believe that secondhand smoke may cause lung cancer in people who do not smoke because nonsmokers often breathe in the smoke， from other people"s cigarettes. 47______ The US Environmental Protection Agency reports that about 53，000 people die in the United States each year as a result of exposure to secondhand smoke.

The smoke that comes from a lit cigarette contains many different poisonous chemicals. In the past， scientists did not think that these chemicals could harm a nonsmoker"s health. 48______ They discovered that even nonsmokers had unhealthy amounts of these toxic （有毒的 ） chemicals in their bodies. As a matter of fact， almost all of US breathe tobacco smoke at times， whether we realize it or not. For example， we cannot avoid secondhand smoke in restaurants， hotels and other public places. Even though many public places have nonsmoking areas， smoke flows in from the areas where smoking is permitted. It is even harder for children to avoid secondhand smoke.

49______ Research shows that children who are exposed to secondhand smoke are sick more often than children who live in homes where no one smokes and that the children of smokers are more than twice as likely to develop lung cancer when they are adults as are children of nonsmokers. The risk is even higher for children who live in homes where both parents smoke.

People are becoming very aware of the dangers of secondhand smoke. 50______

回答（46）题 查看材料

A.Recently， though， scientists changed their opinion after they studied a large group of nonsmokers.

B.The Gilsons have been married for 35 years.

C.This smoke is called secondhand smoke.

D.However， secondhand smoke is dangerous to all people， old or young.

E.As a result， they have passed laws which prohibit people from smoking in many public places.

F.In the United States， nine million children under the age of five live in homes with at least one smoker.

A、worked

B、working

C、work

D、to work

A. in

B. with

C. on

D. at

What can be inferred about the use of GPS nowadays?

A．GPS can be used nearly 24 hours a day.

B．GPS can be used in certain places in the world.

C．GPS can be used in any weather conditions

D．GPS can be used with subscription or setup fees.

Most of us tell one two lies a day, according to scientists who study these things. And we rarely get caught, because the lies we tell are usually little ones: "I got stuck in traffic." "That color looks good no you." "I was just about to call."

But even the smallest fib may soon be systematically exposed, at least in the virtual World. Researchers at several universities are developing software that can detect lies in online communications such as instant messages e-mails and chatrooms. The ability to spot "digital deception", as researchers call it, has never been more crucial. Today, much of our business and social life is conducted online, making us increasingly vulnerable. White collar criminals, sexual predators, scammers, identity thieves and even terrorists surf the same Web as the rest of us.

Conventional lie detectors look for physiological signs of anxiety--a bead of sweat or a racing pulse--but online systems examine only the liar's words. "When we're looking at Ianguage, we're looking at the tool of the lie," says Jeff Hancock, all assistant professor of communication and a member of the faculty of computing and information science at Cornell University.

Hancock, who recently received a $ 680, 000 grant from the National Science Foundation to study digital deception, says there is a growing body of evidence that the language of dishonest messages is different than that of honest ones. For example, one study led by Hancock and due to be published this spring in Discourse Processes found the deceptive e-mail messages contained 28 percent more words on average and used a higher percentage of words associated with negative emotions than did truthful messages. Liars also tend to use fewer first-person references (such as the pronoun "I") and more third-person references (such as "he" and "they"). This may be the liar's subconscious way of distancing himself from his lie.

More surprising, Hancock and his colleagues have observed that the targets of liars also exhibit distinctive language patterns. For instance, people who are being deceived often use shorter sentences and ask more questions. Even though they may not be aware that they are being lide to, people seem to exhibit subconscious suspicions.

To identify the patterns of deceit, Hancock has developed an instant-messaging system at Cornell that asks users to rate the deceptiveness of each message they send. The system has already collected 10, 000 messages, of which about 6 percent qualify as patently deceptive. Eventually the results will be incorporated into software that analyzes incoming messages.

For now, the Cornell researchers are working only with the kinds of lies told be students and faculty. It remains to be seen whether such a system can be scaled up to handle "big" lies, such as messages sent by con artists and terrorists.

Fortunately, the research so far suggests that people lie less often in e-mail than face-to-face or on the phone. Perhaps this is because people are reluctant to put their lies in writing, Hancock speculates. "An email generates multiple copies," he says. "It will last longer than something carved in rock." So choose your words carefully. The internet may soon be rid not only deceit but also of lame excuses.

The digital polygraph conducts testing based on ______ .

Friendly Advice: The main cause for boys and girls to start drinking or smoking is whether they have friends who do, a National Institute of Health study suggests. Researchers find that school children are likely to do the same things as their five closest friends do, and girls are more likely than boys to give in to pressure to drink. However, the parents' role makes a difference: Children whose moms and dads talk and listen to them regularly are less likely to smoke and drink.

Crying for a Smoke: New moms are often annoyed by the cries of new-bore babies, but according to one study, there is something they can do about it: Give up smoking. Researchers at a Netherlands organization of scientific research questioned parents of 3,000 babies up to six months old and found that stomachache was three times as likely in small babies whose mothers smoked 15 to 30 cigarettes a day, either before or after their babies were born. No data yet on Dad's smoking, but it's a safe suggestion that he should put the cigarettes out, too.

Out of Shape: Even as the number of overweight children increases, many schools are making unhealthy habits worse by cutting back on sports classes. Physical education is meant to provide exercise and encourage lifetime fitness, but a recent study found that only 26% of high schools require at least three years of physical education. It's worse in lower grades: California middle school students get only 25 minutes of physical activity a week.

What problem may be caused by planting chips in the human body?

A．People will be controlled by computers.

B．Computers could send out wrong information.

C．Chips can be the cause of diseases.

D．Information may be used improperly.