DOC《第壹部分： 选择题（占72分）》

s most dazzling spectacles. Science is still not certain

16 exactly what these lights are and what causes them. Sometimes, the brilliant rays of light spread upward in the shape of a fan.

17 , they flash here and there like giant searchlights. Farther north, the aurora frequently looks like fiery draperies which hang from the sky and sway

18 while flames of red, orange, green, and blue play up and down the moving folds. According to scientific measurements, this discharge of light

19 from

50 to

100 miles above the earth. It is seen

20 around the Hudson Bay region in Canada, in northern Scotland, and in southern Norway and Sweden. 北方的光,也就是北极光,是大自然中最耀眼的奇观之一.科学上对16.关於这些光到底是什麽及其形成的原因仍然不确定.有时候,这些灿烂夺目的光线以扇子的形状往上扩散.17.其他的时候,它们就像巨大的探照灯到处闪烁.在更北边的地方,极光常常看起来像是挂在天空火红且打摺的布,当红澄绿蓝的火焰上上下下玩弄著移动的皱摺时随之18.前后摇摆. 根蒲Р饬,光线的发放19.发生在地球上空五十到一百英里处.20.最佳的观赏点在加拿大哈德逊湾区附近、苏格兰北方以及挪威和瑞典的南方. 16. (A) due to (B) instead of (C) as to (D) in spite of (A) 由於 (B) 而不是 (C) 关於 (D) 尽管 [解析] be certain about sth. 意为「对关於…表示确定」,故依囊庋(C). 17. (A) At one time (B) At other times (C) At all times (D) At the same time (A) 曾经 (B) 其他时候 (C) 总是 (D) 同时 [解析] 前一句提到极光有时候(sometimes)会成扇形向上扩散,下一句应接著谈其他时候的状况,故答案选(B). 18. (A) here and now (B) by and large (C) to and fro (D) more and more (A) 此时此地 (B) 大体而言 (C) 前前后后 (D) 越来越多 [解析] sway(摆动)的用法应与上下、左右、前后等字连用,故选(C). 19. (A) takes place (B) was taking place (C) had taken place (D) took place (A) ~ (D) 发生 [解析] this discharge of light为句子的主词,后应接动词,而此句描述一个事实,没有指特定的时间,故使用现在简单式. 20. (A) in the least (B) on the whole (C) for its sake (D) at its best (A) 最少 (B) 大体而言 (C) 为了它的缘故 (D) 最佳 [解析] 句中特别提到数个地区都可观看到北极光,根湟庵挥(D)符合,指的是最佳观赏地点. 第21 至25 题为题组 Average global temperature has increased by almost 1° F over the past century. Scientists expect it to increase an

21 2° to 6° F over the next one hundred years. This may not sound like much, but it could change the Earth'

s climate as

22 before. Climate change may affect people'

s health both directly and indirectly. For instance, heat stress and other heat-related health problems are caused directly by very warm temperatures.

23 , human health can also be affected by ecological disturbances, changes in food and water supplies, as well as coastal flooding. How people and nature

24 climate change will determine how seriously it affects human health. Generally, poor people and poor countries are

25 probable to have the money and resources they need to cope with health problems due to climate change. 全球平均气温在过去的一个世纪中几乎增加了华式一度.科学家们预期接下来的一百年会增加21.额外的华氏二到六度.这个数字起来也许不是很多,但是它可能会改变地球的气候是前所22.未见的. 气候的改变也许会直接和间接地影响人们的健康.例如,炎热所带来的热衰竭和其他与炎热相关的健康问题是直接由高温所造成的.人类的健康也会23.间接地受到生态失衡、食物及饮水供应的改变以及沿海地区的泛滥等的影响.人们和自然如何24.适应气候的改变将会决定它影响人类健康的程度有多严重.一般说来,穷人和贫穷国家25.比较没有可能拥有所需的金钱与资源去处理因为气候改变所引起的健康问题. 21. (A) extreme (B) additional (C) immediate (D) original (A) 极端的 (B) 额外的 (C) 立即的 (D) 最初的 [解析] 第一句提到上个世纪全球平均温度增加了一度,科学家预期未来将会再增加二到六度.这是额外增加的,故本题应选(B). 22. (A) ever (B) never (C) always (D) yet (A) 曾经 (B) 从未 (C) 总是 (D) 尚未 [解析] 二到六度所显示的数字差异虽不大,但却是前所未见的,亦即as it never did before,其中it与did省略,故答案应选(B). 23. (A) Suddenly (B) Previously (C) Exclusively (D) Indirectly (A) 突然 (B) 先前 (C) 专门地 (D) 间接地 [解析] 本段提到气候改变会直接(directly)与间接(indirectly)地影响人类健康,本........