涉海英语读写教程-课后答案Unit 5(简洁版).docVIP

Unit 5 Marine Disasters Text A Part I III． Vocabulary Study A. 1. ultimately 2. inadvertently 3. decay 4. mechanism 5. precaution 6. sustain 7. recurrent 8. teem 9. penetration 10.contaminate B. 1. C 2. A 3. A 4. A 5. B 6. C 7. A 8. A 9. B 10. C C. 1.maintain 2. reserve 3. excluded 4. incur 5. resume Ⅳ. Cloze 1．in 2．transfer 3．one-month 4．tourism 5．reducing 6．where 7．portion 8．rank 9．potent 10．safety 11．component 12．Moreover 13．unknown 14．estimating 15．disrupted 16．alternate 17．reservation 18．about 19．ruined 20．adversely V. Translation A. 海洋和淡水中聚集着生命，许多很微小，许多没有危害；实际上，所有水中生命最后都以这种微小生命为生。尽管大多数浮游生物和蓝细菌是无害的，但仍然有一些在特定的情况下会产生毒素。通过自身产生毒素或通过聚集大量生物来危害一方，进而影响共生的有机物，改变食物网循环。这些影响包括食用海产品或间接暴露于赤潮毒素中而导致的人类疾病和死亡，沿岸居民和渔业的经济损失，由赤潮导致的鱼类鸟类哺乳动物的死亡。经常呈现绿色棕色，甚至红黄色。不同颜色是由于海藻的种类，水中的生态系统，藻类泛滥既发生在海水中也发生在淡水中。它主要通过以下两种方式产生危害。第一种危害是由产生的毒素造的。毒素直接杀死鱼类或贝类,或者人类通过吃受污染的海产品致病。第二种是通过大量生物群聚集，从而造成环境恶化。这些影响具体包括光线变弱，鱼鳃结，或者是藻类细胞腐烂消耗了过多的氧气。 B． Marine waters teem with microscopic life. Some of them create potent toxins and some of them do harm by accumulating. The alga causing harm is called Harmful Algal Blooms. It not only has impact on health of human beings (such as some known and even unknown diseases), but on wild life as well. In fact, more than 50% of the unusual marine mortality events are now associated with HABs. It is another societal concern that HABs have profound influence on ecosystem. Sometimes, the impact works from bottom up (such as affecting predators and grazing), and sometimes from bottom-up (such as affecting plankton). In spite of the precautions, the socioeconomic impact is substantial. Many millions of dollars are spent annually addressing the HAB-related problems. The money on public health accounts for the largest part, followed by commercial fisheries and tourism. Extended Exercises 1.feel in the pink 2.feeling blue 3. sing the blues 4. tickled pink 5. raises a red flag 6. yellow journalism 7. brown as a berry 8. black sheep Appreciation a