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牛津譯林版高中英語必修五unit3scienceandnature第5課時教案(編輯修改稿)

2026-01-10 04:16 本頁面

　

【文章內(nèi)容簡介】 d crops shows that GM engineering has failed to significantly increase US crop production. Something else, however, has been on the rise, While GM seeds are expensive, GM panies tell farmers that they will make good profits by saving money on pesticides（殺蟲劑） . On the contrary, US government data show that GM crops in the US have produced an overall increase in pesticide use pared to traditional crops. “The promise was that you could use less chemicals and boost production. But her is true,” said Bill Christison, President of the US National Farm Coalition. At the same time, the authors of the book World Hunger: Twelve Myths argue that there actually is more than enough food in the world and that the hunger crisis is not caused by production, but by problems in food distribution and politics. These indeed deserve our efforts and money. Meanwhile, the rise in food prices results from the increased use of crops for fuel rather than food, according to a 2021 World Bank report. As a matter of fact, scientists see better ways to feed the world. Another World Bank report concluded that GM crops have little to offer to the challenges of worldwide poverty and hunger, because better ways out are available, among which “green” farming is supposed to be the first choice. 57. The author develops the second paragraph mainly _________. A. by classification B. by parison C. by example D. by process 58. What does the underlined word “ boost” in the third paragraph probably mean? A. Control. B. Evaluate C. Obtain. D. Increase. 59. GM panies promise farmers that they will benefit from ______________. A. practicing “green” farming B. use of less chemicals C. fair distribution of their crops D. using more crops for fuel 60. Which of the following best describes the attitude of the author towards GM technology? A. Optimistic B. Defensive C. Disapproving D. Casual B Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. Universi ty of Missouri (MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient. “ To provide enough power, we need certain methods with high energy density(密度 )” , said Jae Kwon, assistant professor of electrical and puter engineering at MU. “ The radioisotope (放射性同位素 ) battery can provide power density that is much higher than chemical batteries.” Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe. “People hear the word ‘

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