四六级

　　阅读向来是四级考生的复习重点，在日常练习中大家可以多吸取一些做题经验，也可以通过做练习题多总结答题技巧，下面小编为大家带来了一些英语四级阅读练习题，希望对大家有帮助！

　　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.

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