问题 材料题

  用“……使……”这句句式概括下文说到的与气候有关的各种因素及其对世界作物产量造成的影响。(不超过25个字)

  19世纪以来,世界平均气温已经升高0.7摄氏度。研究显示,温度升高会使作物产量减少。在低纬度地区,气温即使升高1~2摄氏度,都有可能导致作物减产。在中高纬度地区,气候较为凉爽,如果气温升高3摄氏度,再加上空气中二氧化碳含量高,倒有可能增加大米和小麦的产量。可是这些地区由于降雨方式的改变和污染造成普遍缺水,就使得这点好处荡然无存。此外,燃烧矿物燃料产生的污染物与光发生作用在地球表面生成的臭氧含量增加,也会明显降低作物产量。

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答案

气温升高、普遍缺水、臭氧增加将使世界作物减产。

单项选择题
填空题

Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results_____(1) motivated behavior.Motivation can be either positive or negative_____(2) direction. We may feel a driving force toward some object or condition, _____(3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away_____(4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives_____(5) needs, wants or desires,_____(6) negative drives as fears or aversions._____ (7), though negative and positive motivational forces seem to differ dramatically_____(8) terms of physical and sometimes emotional activity, they are basically similar in_____(9) they both serve to initiate and sustain human behavior.____(10) this reason, researchers often refer _____(11) both kinds of drives or motives as needs, wants and desires.Goals, _____(12), can be either positive or negative. A positive goal is one toward_____ (13) behavior is directed and it is often referred to as an approach object. A negative goal is _____(14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to_____(15) types simply as goals. Consider this example. A middle-aged woman may wish to remain_____(16) attractive as possible. Her positive goal is to appear desirable, and_____(17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin_____(18) aging, and therefore she may buy and use face creams._____(19) the former case, she uses perfume to help her achieve her positive goal — attractiveness; in the____(20) case, she uses face creams to help avoid a negative goal — wrinkled skin.