The U．N. agency says farmers should grow different kinds of bananas. This protects against diseases that affect only one kind. Experts warn that disease may cause the Cavendish banana to disappear. This happened earlier to another popular banana because of its genetic weakness against disease.

　　[语篇解读]　香蕉由于遗传性的抗病弱点，在不久的将来有的品种可能会消失。文章列举了两种威胁Cavendish香蕉的真菌病，国际组织建议农民种植更多种类的香蕉。

　　1．What does this passage mainly tell us?

　　A. Bananas are the world’ s most important food crops.

　　B. The risk to a popular banana shows need to grow other kinds.

　　C. There are five hundred different kinds of bananas.

　　D. How to grow bananas in different countries.

　　[解析]　主旨大意题。根据全文内容和结构判断，文章主要介绍威胁Cavendish香蕉的真菌类疾病，进而显示出种植其他种类香蕉的必要性。故答案为B。

　　[答案]　B

　　2．Bananas are threatened by disease because ________.

　　A. they grow from seeds

　　B. they are one of the most valuable exports

　　C. the only way to prevent it is to put chemicals on their leaves

　　D. they have genetic weaknesses against disease

　　[解析]　细节理解题。根据第一段内容可知，香蕉易受病害威胁是因为其遗传上的抗病弱点。后文也有叙述。

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