四六级

2018英语四级阅读理解过级训练(156)

时间:2018-08-23 来源:文都网校 浏览: 分享:

      在英语四级阅读这个板块中,选词填空是最需要技巧的,也是拿分难点,下面小编为大家带来了一篇英语四级阅读选词填空题,希望各位考生多加练习,早日取得好成绩!

      Is GM Food Safe To Eat ?

      Traditional plant breeding involves crossing varieties of the same species in ways they could cross naturally. For example, disease-resistant varieties of wheat have been crossed with high-yield wheat to combine these properties. This type of natural gene exchange is safe and fairly predictable.

      Genetic engineering ( GE) involves exchanging genes between unrelated species that cannot naturally exchange genes with each other. GE can involve the exchange of genes between vastly different species — e.g. putting scorpion toxin genes into maize or fish antifreeze genes into tomatoes. It is possible that a scorpion toxin gene, even when it is in maize DNA1, will still get the organism to produce scorpion toxin — but what other effects may it have in this alien environment? We are already seeing this problem — adding human growth hormone genes to pigs certainly makes them grow — but it also gives them arthritis and makes them cross-eyed, which was entirely unpredictable.

      It will be obvious, for example, that the gene for human intelligence will not have the same effect if inserted into cabbage DNA as it had in human DNA— but what side-effect would it have? In other words, is GM food2 safe to eat? The answer is that nobody knows because long-term tests have not been carried out.

      Companies wanting a GM product approved in the UK or USA are required to provide regulatory bodies with results of their own safety tests. Monsanto’s3 soya beans were apparently fed to fish for 10 weeks before being approved. There was no requirement for independent testing, for long-term testing, for testing on humans or testing for specific dangers to children or allergic4 people.

      The current position of the UK Government is that"There is no evidence of long-term dangers from GM foods."In the US, the American Food and Drug Administration5 is currently being prosecuted for covering up research that suggested possible risks from GM foods.

      Ⅰ. Match the words with their Chinese quivalents:

      1. disease-resistant A. 掩盖( 真相)

      2. side-effect B. 高产的

      3. long-term dangers C. 长期危害

      4. cover up D. 副作用

      5. high-yield E. 抗病的

      Ⅱ. Question:

      What do companies wanting a GM product approved in the UK or USA do?

      参考答案:

      Ⅰ. 1. E 2. D 3 . C 4. A 5 . B

      Ⅱ. They are required to provide regulatory bodies with results of their own safety tests.

      以上就是小编为大家提供的英语四级阅读训练题,希望对大家有帮助。想了解更多四六级备考课程备考资讯,请点击文都网校四六级资讯站查询!有问题找文都☞☞☞详情咨询入口>>>

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