One basic weakness in a conservation system based wholly on economic motives is that most members of the land community have no economic value. Yet these creatures are members of the biotic community and, if its stability depends on its integrity, they are entitled to continuance. When one of these noneconomic categories is threatened and, if we happen to love it, we invert excuses to give it economic importance. At the beginning of century songbirds were supposed to be disappearing. (46)【Scientists jumped to the rescue with some distinctly shaky evidence to the effect that insects would eat us up if birds failed to control them. The evidence had to be economic in order to be valid.】 It is painful to read these roundabout accounts today. We have no land ethic yet, (47)【but we have at least drawn nearer the point of admitting that birds should continue as a matter of intrinsic right, regardless of the presence or absence of economic advantage to us.】 A parallel situation exists in respect of predatory mammals and fish-eating birds. (48)【Time was when biologists somewhat overworked the evidence that these creatures preserve the health of game by killing the physically weak, or that they prey only on “worthless” species.】 Here again, the evidence had to be economic in order to be valid. It is only in recent years that we hear the more honest argument that predators are members of the community, and that no special interest has the right to exterminate them for the sake of a benefit, real or fancied, to itself. Some species of trees have been “read out of the party” by economics-minded foresters because they grow too slowly, or have too low a sale vale to pay as timber crops. (49)【In Europe, where forestry is ecologically more advanced, the non-commercial tree species are recognized as members of the native forest community, to be preserved as such, within reason.】 Moreover, some have been found to have a valuable function in building up soil fertility. The interdependence of the forest and its constituent tree species, ground flora, and fauna is taken for granted. To sum up: a system of conservation based solely on economic self-interest is hopelessly lopsided. (50)【It tends to ignore, and thus eventually to eliminate, many elements in the land community that lack commercial value, but that are essential to its healthy functioning.】 It assumes, falsely, that the economic parts of the biotic clock will function without the uneconomic parts.
15. She suggested that we ___ early tomorrow.A. leaveB. left;C. will leaveD. are leaving
多选题(共20题,40.0分) 23. (2.0分) 以下句子没有任何错误的是()。A. “I'm the least experienced of all the doctors here” can be translated into“我是这里经验不足的医生之一。”B. You must go early or you won't get a seat.C. Obviously we aren't trying to put you away learning English.D. How well you learn something, not how fast you learn it, is the critical factor in remembering
By that time the steel_will have greatly increased.A. outsideB. outlineC. outputD. outcome
(单选题,3分) -Hi, Tom. How is everything going? -______.A. No, I don't.B. Yes, please.C. Thank you a lot.D. Not bad.
Ensuring that food is cooked to the correct temperature is to use a ________.确保食物烹饪到正确温度的最佳检测方法是使用什么工具?(1分)*A. Calibrated thermometer / 校准过的温度计B. All of the answers are correct / 所有选择都是C. Using a spoon / 用勺子D. Thermal scanner / 热扫描仪
(单选题,3分) - Lily, did you have a good weekend? -_______A. Yes,it was wonderful.B. Thanks for caring.C. It's a pleasure.D. Oh,that's very nice of you.
What is the secondary shelf-life of hot prepared food when stored in the chiller? 储存在冰箱中热加工的食品,第二保质期是多少小时?A. 96 hours / 96小时B. 72 hours / 72小时C. 48 hours / 48小时D. 24 hours / 24小时
阅读短文,判断正误One day, while Ali and his father were walking along a sandy beach, Ali said, "Waves are fun. What makes the waves?" His father said, "The waves are made by the wind. As the wind blows, it pushes the water ahead of it. The water is able to gain energy from the wind because of the friction between the wind and water. Storms can make giant waves if the wind blows in the same direction for a long time." "How big are giant waves?" Ali asked. "Giant waves are so big that they could go over our heads, cover us up, and wash us away," his father replied. "I do not think giant waves are fun. I like gentle waves," said Ali.4. Giant waves are dangerous.A、正确B、错误
9.21 第九单元习题17.[填空题] pass()第1空:
热门问题
拼写合适的单词补全句子(答案不区分大小写;单词提提示中一根小短线代表一个字母)Something that is inf- - - - - has no limit,end,or edge.
These drugs are available over-the-counter without a(n)__________. ()A. infectionB. dosageC. prescription
The increase in international business and in foreign investment has created a need for executives with knowledge of foreign languages and skills in cross-cultural communication. Americans, however, have not been well trained in either area and, consequently, have not enjoyed the same level of success in negotiation in an international arena as have their foreign counterparts. Negotiating is the process of communicating back and forth for the purpose of reaching an agreement. It involves persuasion and compromise, but in order to participate in either one, the negotiators must understand the ways in which people are persuaded and how compromise is reached within the culture of the negotiation. In many international business negotiations abroad, Americans are perceived as wealthy and impersonal. It often appears to the foreign negotiator that the American represents a large multi-million-dollar corporation that can afford to pay the price without bargaining further. The American negotiator’s role becomes that of an impersonal supplier of information and cash. In studies of American negotiators abroad, several traits have been identified that may serve to confirm this stereotypical perception, while undermining the negotiator’s position. Two traits in particular that cause cross-cultural misunderstanding are directness and impatience on the part of the American negotiator. Furthermore, American negotiators often insist on realizing short-term goals. Foreign negotiators, on the other hand, may value the relationship established between negotiators and may be willing to invest time in it for long-term benefits. In order to solidify the relationship, they may opt for indirect interactions without regard for the time involved in getting to know the other negotiator. Clearly, perceptions and differences in values affect the outcomes of negotiations and the success of negotiators. For Americans to play a more effective role in international business negotiations, they must put forth more effort to improve cross-cultural understanding. [共5题](1)What kind of manager is needed in present international business and foreign investment? [本题2分]A. The man who represents a large multi-million-dollar corporation. B. The man with knowledge of foreign languages and skills in cross-cultural communication. C. The man who is wealthy and impersonal. D. The man who can negotiate with his foreign counterparts.
选择合适的单词补全句子
The Harry Potter series, written by J.K. Rowling, is perhaps the most popular set of novels of the modern era. With seven books and many successful films to its name, the series has gathered about 15 billion dollars in sales. How did the series become so popular? The reason can be broken down into several areas.The first book in the series was rejected 12 times before it was picked up by Bloomsbury—a small publisher in England. So receiving this contract was Rowling's first step to success. However, getting a book contract does not ensure the success of a book. The story was soon loved by children and adults alike. In light of this, Bloomsbury Publishing published a second version of the books with “adult” (less colorful and more boring) book covers. This made it easier for a full range of ages to enjoy the series.Another factor that worked like a charm was that the publisher and Rowling herself, through the books, conducted midnight releases, promotions, and pre-ordering more readers. Customers who feared that their local bookstore would run out of copies responded by pre-ordering over 700,000 copies before the July 8, 2000 release.What does the underlined word “releases” (Para. 3) mean?A. The activity that frees or expresses energy or emotion.B. The announcement about the book’s publishing information.C. The sales of books that is available only at midnight.
question or statement.Hot pot is a traditional dish in China. It is believed to date back more than 1,000 years to the time of the Jin Dynasty. Hot pot's origins can be found in the dining practices of Mongolian horsemen who rode across the steppe and into northern China. Legend has it that the Mongols used their helmets as pots to simmer (炖) broth (汤底) over open fires, and cooked chunks of meat in the broth.Hot pot cooking seems to have spread to northern China during the Tang Dynasty. In the regional variations developed with different ingredients such as seafood. In the centuries that witnessed the growth of the Song Dynasty, hot pot moved — and changed — further south, with each successive region adapting it to their local ingredients and tastes.The ingredients in a hot pot vary a lot from region to region. Perhaps the most famous hot pot is the Chongqing or Sichuan hot pot. It features a dark red broth chock-full (塞满了的) of spices, chili peppers, and the uniquely mouth-numbing Sichuan peppers. In Beijing and elsewhere in the north, hot pot broth tends to be mild and, compared to its racy southern "cousins", a little light. In the northeast of China, a kind of local sauerkraut (酸菜) is used to add some tang (强烈的味道), making the broth a bit sour. People can choose a version of hot pot according to their taste.1 Hot pot is believed to date back more than 1,000 years to the time of _______.A. the Jin Dynasty B. the Tang DynastyC. the Song Dynasty D. the Yuan Dynasty
The coming of the railways in the 1830s ________ our society and economic life.A. transferredB. transformedC. transportedD. transmitted
拼写合适的单词补全句子 ( 答案不区分大小写 ; 单词提示中一根小短线代表一个 字母 ) If there is a bo-- in the economy, there is an increase in economic activity.
拼写合适的单词补全句子 ( 答案不区分大小写 ; 单词提示中一根小短线代表一个 字母 ) To enh ---- something means to improve its value, quality, or attractiveness.
拼写合适的单词补全句子 ( 答案不区分大小写 ; 单词提示中一根小短线代表一个字母 ) A seq----- of events or things is a number of events or things that come one after another in a particular order.
6. The children will now play some pieces of music that they ______ themselves. A.were taught posed C.accomplished D.worked7. While she waited,she tried to ______ her mind with pleasant thoughts of the vacation. A.occupy pose C.think D.intensify8. In the film,the peaceful life of a monk ______ the violent life of a murderer. A.is compared with B.is compared to C.is contrasted to D.is contrasted with9. ______ to pay for an order is simplicity itself. A.Use plastic B.Using plastics C.Using plastic D.Used plastic10. Additional time is required for cooking or ______ homemade dishes. A.chill B.to chill C.chilled D.chilling
拼写合适的单词补全句子(答案不区分大小写;单词提示中一根小短线代表一个字母) Someone or something that is so---- is very serious rather than cheerful or humorous.
一、拼写合适的单词补全句子(答案不区分大小写;单词提示中一根小短线代表一个字母) If someone is __ob---__ , they are extremely fat.
Elder and weaker Mr. Mag paid_visits to his old friends.A. scarceB. rare()C. insufficientD. inadequate
选择合适的单词补全句子。-|||-I __ in the city.-|||-live lives
拼写合适的单词补全句子 ( 答案不区分大小写 ; 单词提示中根小短线代表一个 字母 ) A va---- is a space that contains no air or other gas.
If you_________in a job for several years, you may be able to accumulate a lot of work experience and skills that would be beneficial to your future career development.A. have workedB. had workedC. have been workingD. had been working
拼写合适的单词补全句子 ( 答案不区分大小写 ; 单词提示中一根小短线代表一个 字母 ) To aut _ _ _ _ _ a factory , office , or industrial process means to put in machines which can do the work instead of people.
ⅢComplete the following sentences with the given sentence structures-|||-get ready for.sa为························备-|||-e.g.Susan has to buy a lot of things to get ready for her trip.(苏珊不得不买很多东西为旅行做准备。)-|||-1 The boy got up early to __ (为上学做准备).-|||-2 I have a lot of work to do to __ (为明天做准备).