18.From Paragraph 2，we can learn that genetically modified foods

　　.

　　A.do no harm to people

　　B.have caused some problem

　　C.are well received after being tested

　　D.are criticized and attacked by many people

　　答案　D

　　解析　细节理解题。根据第二段第一、二句“Genetically modified foods have come under heavy fire lately.There are some countries that are against buying these types of foods.”可知，转基因食品最近受到了强烈的抨击，一些国家反对销售转基因食品。故选D。

　　19.What’s the writer’s attitude towards genetically modified foods?

　　A.We should warn people that they are too dangerous to be eaten.

　　B.We should give people information about them so that they can decide whether to buy them.

　　C.We should encourage people to eat them because they are more nutritional.

　　D.We should tell people that they are trying to fool the farmers.

　　答案　B

　　解析　细节理解题。根据最后一段最后一句“By providing these people with the necessary information，we can allow them to make decisions about these foods.”可知，作者认为，有关部门应提供有关转基因食品的必要信息，让人们自己来决定是否购买转基因食品，故选B。

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