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[单选题]

As we know, the central and essential ingredient of CAD/CAM is the（)

A.hardware

B.digital computer

C.software

D.mouse

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发布时间：2022-10-01

更多“As we know, the central and essential ingredient of CAD/CAM is the()”相关的问题

第1题

School authorities often refuse to face the problem; government drug abuse agencies have d

one all too little to inform. the public about it; many physicians still seem unaware of it when they examine teenagers. As a result, parents may still be the last to know that their children have fallen victim to the drug epidemic that has been raging for more than a decade among American's youth. In a 1980 survey of a middle income Cincinnati suburb, 38 per cent of the sixth grade and 89 per cent of the senior class said they used drugs and/or alcohol; 48 per cent of the parents thought their children used alcohol, but only 8 per cent thought their children used drugs.

Fortunately, there is a new force at work against this epidemic — a nationwide movement of more than 400 parent groups formed to expose and battle drug use among teenagers and preteens. The groups, ranging in size from 15 members to more than 800, have different approaches and widely varying rates of success. Yet this parental crusade is the only major force in the country to have taken active, organized and effective steps aimed at stopping marijuana use.

Why the concentration on marijuana？ Because it is the illegal drug most used by kids. According to the 1982 National High School Senior Survey, 44 per cent of U.S. high school seniors had smoked pot during the year, and one out of seven of these were daily or near daily smokers.

Moreover, in 1982, sociologists, Richard Clayton and Harwin Voss, reported a close related connection between pot smoking and subsequent use of cocaine and heroin by young men. Of those who had smoked pot fewer than 100 times, seven per cent had graduated to cocaine, four per cent to heroin. But of those who had smoked pot at least 1,000 times, the equivalent of once a day for those years, 73 per cent had gone on to cocaine, and one out of three had graduated to heroin. (Although heroin use among high school seniors is minimal— 0.6 per cent in the past year — multi drug use is "in.")

Parent groups have found that by stopping their kids from smoking pot, they almost automatically stop all other illegal drugs and cut down on alcohol use as well. The High School Senior Survey's statistics show that heavy pot smokers tend to be heavy drinkers, while those who do not use pot tend not to drink heavily.

Since virtually all over the country teenager "partying" has come to mean "getting smashed and getting stoned" — on anything from pot to pills, hashish, ISD, angel dust and alcohol — some parent groups home in on the partying aspect. Parents Who Care (PWC) was started in November 1979 by 15 Palo Alto, Calif. parents who were upset by stories of drugs senior proms. They held talk sessions with their children and learned, as founder Joann Lundgren observed, that most of them had never been to a party where the main activity was not getting high.

The parents' solution: workshops showing kids how to give successful drug and alcohol free parties. Says Margery Ranch, PWC director: "We've seen a change in attitude. Young people are feeling more comfortable saying no."

What does "the problem" in the first line refer to？

A．The fact that government drug abuse organizations are reluctant to inform. the public of the drug taking phenomenon among teenagers.

B．The fact that many doctors are ignorant of the drug taking phenomenon among teenagers.

C．The fact that many parents are ignorant of the drug taking phenomenon among their children.

D．The fact that many young people have yielded to the wide use of drugs.

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第2题

For centuries, in the countries of south and Southeast Asia the elephant has been an intim

ate part of the culture, economy and religion, and nowhere more so than in Thailand Unlike its African cousin, the Asian elephant is easily domesticated (驯化). The rare so-called white elephants have actually lent the authority of kingship to its rulers and until the 1920s the national flag was a white elephant on a red background.To the early Western visitors the country’s romantic name was “Land of the White Elephant”.

Today, however, the story is very different. Out of work and out of land, the Thai elephant struggles for survival in a nation that no longer needs it. The elephant has found itself more or less abandoned by previous owners who have moved on to a different economic world and a westernized society. And while the elephant’s problems began many years ago, now it rates a very low national priority.

How this reversal from national icon (圣像) to neglected animal came about is a tale of worsening environmental and the changing lives of the Thais themselves. According to Richard Lair, Thailand’s experts on the Asian elephant and author of the report Gone Astray, at the turn of the century there may well have beenas many as 100,000 domestic elephants in the country. In the north of Thailand alone it was estimated that more than 20,000 elephants were employed in transport, 1,000 of them alone on the road between the cities of Chiang Mai and Chiang Saen. This was at a time when 90 per cent of Thailand was still forest—a habitat (栖息地) that not only supported the animals but also made them necessary to carry goods and people. Nothing ploughs through dense forest better than a massive but sure-footed elephant.

By 1950 the elephant population had dropped to a still substantial 13,397, but today there are probably nomore than 3,800, with another 1,350 roaming free in the national parks. But now, Thailand’s forest coversonly 20 per cent of the land This deforestation (采伐森林) is the central point of the elephant’s difficult situation, for it has effectively put the animals out of work. This century, as the road network grew, so the elephant’s role as a beast of burden declined.

Choose correct answers to the question:

What can we know about African elephants from the passage？

A.It is easy to tame them.

B.It is hard to tame them.

C.They are living a better life than Asian elephants.

D.Their fate is quite similar to that of Asian elephants.

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第3题

We can trust him because we know ____________ （他是个守信的人).

We can trust him because we know ____________ (他是个守信的人).

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第4题

Children are【C1】______ serious illnesses because of their parents smoking at home, rays th

e government's chief medical officer, who has warned adults not to light【C2】______ in front of their sons and daughters.

Sir Liam Donaldson, Britain's most senior doctor,【C3】______ that there would be a further【C4】______ crackdown on smoking after the ban comes into force in England next Sunday.

He promised renewed public health advertising campaigns to try to educate parents who smoke. "We will strengthen and make【C5】______ the message to parents about the risks to their children of smoking. This is something we will need to constantly remind them about."

" 【C6】______ the number of parents who make is falling, children's exposure【C7】______ parental smoke remains "a problem area", he said.

The number of Britons who smoke has fallen to 24 per cent and ministers hope going smoke-free will 【C8】______ time bring about another 4 or 5 per cent drop. " 【C9】______ if we want to go【C10】______ we have got to reinforce all these other tobacco measures and denormalise smoking completely," said Donaldson.

"The first of July is trot when action stops; it's a launchpad from 【C11】______ we can make further massive 【C12】______ . I hope people will be behind some of the slightly【C13】______ measures."

He wants cigarettes to be【C14】______ away in shops. "If you walk into the average supermarket, one of the things that confronts you【C15】______ away is a wall of cigarettes. That's【C16】______ . I'd like to see them【C17】______ the wall of cigarettes and keep them under the counter," said Donaldson.

"Some people would【C18】______ the idea of cigarettes being kept under the counter like magazines that you wouldn't want displayed. But I think that these are all part of the denormalisation【C19】______ . Supermarkets are big, responsible organisations. Wouldn't they like to strike another【C20】______ for health and play their part on a disease that still kills over 100,000 a year？"

【C1】

A．subtracting

B．abstracting

C．distracting

D．contracting

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第5题

We all know that Mr. Green was not _______ with the poem.

A.pleasant

B.please

C.pleasing

D.pleased