| Successful innovations have driven many
older technologies to extinction and have resulted in higher productivity,
greater consumption of energy, increased demand for raw materials, accelerated
flow of materials through the economy and increased quantities of metals and
other substances in use per person. The history of industrial development is
full of examples. In 1870, horses and mules were the prime source of power on U. S. farms. One horse or mule was required to support four human beings—a ratio that remained almost constant for many decades. At that time, had a national commission been asked to forecast the horse and mule population for 1970, its answer probably would have depended on whether its consultants were of an economic turn of mind. Had they been "economists", they would have recognized that the power of steam had already been harnessed t A. He is excited about them. B. He is disturbed by them. C. He questions their usefulness. D. He accepts them as natural. [填空题]Many a student (ask){{U}} {{/U}}the same questions by the teacher in yesterday’s class.
[简答题]The attacks on public education ______ many top teachers so the latter decide to march on Washington to demonstrate against them.
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Questions 15 to 17 are based on a talk on student housing. You now have 15 seconds to read Questions 15 to 17. [简答题]Many women today feel the same stress to produce and get ahead, and _______________________(同时又要养育子女，承担起各种家庭责任).
[简答题]Finally, many great players come from the same kind of neighborhood--a poor, crowded area where a boy’s dream is not to be a doctor, lawyer, or businessman, but to become a rich, famous. athlete or entertainer. (Passage Four)
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