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    Space vegetables are grown from seeds (种子) that have been taken to space and brought back to the earth. The seeds are affected by the radiation (辐射) and low gravity in space. When they are brought back to the earth, these seeds produce vegetables that are bigger and healthier than normal vegetables. However, some people worry about eating space vegetables. They think that space vegetables might not be good for us and could make us get sick because of the radiation in space. However, people should not be frightened because space vegetables are very healthy.
    Here are some facts that you should know about space vegetables.
    Space vegetables are grown from seeds that are carefully chosen. When seeds are brought back from space, they are tested to make sure that they will be safe to eat.
    Space vegetables are better for you than normal vegetables. For example, space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes.
    After genetically modified (转基因) food appeared in the market, people worried that they were eating unknown things. For example, if nut genes (坚果基因) are put inside potatoes, people allergic (过敏的) to nuts might get sick from eating these potatoes because they do not know they are also eating nuts. Unlike genetically modified food, space vegetables have not been genetically changed. This means that no new genes are put into the vegetables. Therefore, there are no dangers of eating something unknown.
    小题1:The seeds brought back from space produce ______ vegetables according to the passage.
    A．more deliciousB．healthier and bigger
    C．more dangerousD．cheaper and healthier
    小题2:Genetically modified food is different from space vegetables because it ______.
    A．is grown in spaceB．has nothing unknown
    C．has been genetically changedD．has no new genes
    小题3:According to the passage, normal tomatoes can stay fresh for about ______ days.
    A．sevenB．thirteen C．twentyD．twenty-seven
    小题4:The writer wants to tell us that ______.
    A．space vegetables are grown in space
    B．everybody worries about eating space vegetables
    C．space vegetables are safe and good for people to eat
    D．space vegetables may bring illness to us because of the radiation in space

    小题1:B
    小题2:C
    小题3:B
    小题4:C

    试题分析：本文主要讲述了太空蔬菜是由从太空带回来的种子种植的蔬菜，比普通蔬菜要更大更健康。有人担心蔬菜种子在太空中收到辐射，长出的蔬菜会对身体有害。其实不然，从太空带回来的种子经过精挑细选来保证它是安全的。一些太空蔬菜要比普通蔬菜更好，比如太空西红柿可以保鲜20天，比普通的多一周。在经历了市场转基因实物之后，人们会担心他们在吃一些自己不知道的食物。太空食物是不发生基因变化的。
    小题1:细节理解题。 根据文章中When they are brought back to the earth, these seeds produce vegetables that are bigger and healthier than normal vegetables. 可知选B。
    小题2:细节理解题。根据文章的句子Unlike genetically modified food, space vegetables have not been genetically changed. 可知，转基因蔬菜的基因是发生变化的。故选C。
    小题3:细节理解题。根据文中的句子space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes.可知普通的西红柿是20天减一周，是13天。故选B。
    小题4:主旨大意题。文章主要在证明太空蔬菜是健康的。故选C。
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