Question

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 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.

1.Genetically modified food is different from space vegetables because it       .

A. is grown in space

B. has nothing unknown

C. has been genetically changed

D. has no new genes

2.According to the passage, normal tomatoes can stay fresh for about       days.

A. seven                             B. thirteen

C. twenty                            D. twenty-seven

3.The underlined word "allergic" means“       ”in Chinese.

A.过敏                              B.种植

C.发现                              D.出售

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

Answer

1.C

2.B

3.A

4.C

【解析】

试题分析：本文讲述的是太空蔬菜。它是由被带入太空后又被带回来的种子种植出蔬菜。太空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受到辐射，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。太空蔬菜是不发生基因变化的，不是转基因食物。

1.C 细节理解题。题意：转基因食物和太空蔬菜不同是因为什么？A. is grown in space生长在太空；B. has nothing unknown没有不为人所知的东西；C. has been genetically changed被改变了基因；D. has no new genes没有亲的基因。由最后一段的： Unlike genetically modified food, space vegetables have not been genetically changed. 可知太空蔬菜未发生基因改变，即：转基因食物发生了基因改变。故选C。

2.2】B推理判断题。题意：根据短文内容，普通西红柿可以保持新鲜多少天？A. seven7； B. thirteen13；C. twenty20；D. twenty-seven27。由倒数第二段里的：For example, space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes.可知，太空西红柿可以保存20天，比普通西红柿长7天：20-7＝13天。故选B。

3.3】A 词义猜测题。题意：有下划线的"allergic"的中文意思是什么？A.过敏；B.种植；C.发现；D.出售。句意：people allergic to nuts might get sick from eating these potatoes because they do not know they are also eating nuts.对坚果allergic的人们因为不知道吃西红柿时也吃了坚果，因此可能生病。吃坚果生病，说明对坚果有不良反应，即“过敏”。故选A。

4.4】C 主旨大意题。题意：作者想要告诉我们什么？A. space vegetables are grown in space太空蔬菜种在太空；B. everybody worries about eating space vegetables每一个人担忧吃太空蔬菜；C. space vegetables are safe and good for people to eat太空蔬菜是安全的，吃了对人们有好处；D. space vegetables may bring illness to us because of the radiation in space因为太空辐射，太空蔬菜可能给人们带来疾病。结合短文大意：太空蔬菜不存在转基因，是安全的。故选C。

考点：考查科普类短文阅读。