Modern mass-production methods lower the cost of making goods，and thus give us better values．At the same time，American ingenuity and science are constantly at work improving t

Banks are not ordinarily prepared to pay out all accounts；they rely on depositors not to demand payment all at the same time．If depositors should come to fear that a bank is n

Prices determine how resources are to be used．They are also the means by which products and services that are in limited supply are rationed among buyers．The price system of the

Testing has replaced teaching in most public schools．My own children's school week is framed by pretests，drills，tests，and retests．They know that the best way to read a textbook i

    When Mrs．Joseph Groeger died recently in Vienna，Austria，people asked the obvious，“Why did she live to be 107？”．Tentative answers were provided by a survey conducted among 148Viennese men and women who had reached the age of 100．Somewhat surprising was the fact that the majo

    During the rest of sleep，the fatigue of the body disappears and recuperation（复原，恢复）begins．The tired mind gathers new energy；the memory improves；and annoyance and problems are seen in better perspective．

    In recent years，scientific and technological developments have drastically changed human life on our planet，as well as our views both of ourselves as individuals in society and of the universe as a whole．Maybe one of the most profound developm

Package holidays，covering a two weeks'stay in an attractive location are increasingly popular，because they offer an inclusive price with few extras．Once you get to the airport，it is up to the tour operator to see that you get safely to your destination．Excursions，local entertainment， sw

Ever since humans have inhabited the earth，they have made use of various forms of communication．Generally，this expression of thoughts and feelings has been in the form of oral speech．When there is a language barrier，communication is accomplished through sign language in which motions

Watch a baby between six and nine months old，and you will observe the basic concepts of geometry being learned．Once the baby has mastered the idea that space is three dimensional，it reaches out and begins grasping various kinds of objects．It is then from perhaps nine to fifteen months that the concepts of sets

In spite of the wealth of examples of urban architecture in older cities，both in Europe and in the United States，solutions to current problems of the physical decay of cities in the United States have come slowly．The first reaction after the war was to bulldoze and build bri

    Directions:Translate the following underlined sentences into Chinese.
    ①In part,the sudden re-emergence of technological progress  is the climax of years of research in different fields that are finally reachi

    9. Anne Frank's diary was written(A) during the two years her(B) and her family were hiding(C)in(D) the loft of a warehouse. (TOEFL,1974.11)
    10.To(A) the finalists, Bob and I(B), the last high jump was the most excit

    11.The cells of many animals, including 　　　, are very complex.
      A) a man B) man   C) the man D) the men
    12.It is impossible to see a virus at work inside a living c

  Choose the best answer from the four words in the blanks:
    1.The new medicine should (heal,cure,treat,remedy) you of your cold.
　　2.The postman (sent,relayed,delivered,passed) the letters promptly.