14.Space vegetables are grown from seeds(種子)that have been taken to space and brought back to the earth.The seeds are affected by the radiation(輻射)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(轉基因)food appeared in the market,people worried that they were eating unknown things.For example,if nut genes(堅果基因)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.
30.Genetically modified food is different from space vegetables because itC.
A.is grown in space                    
B.has nothing unknown
C.has been genetically changed          
D.has no new genes
31.According to the passage,normal tomatoes can stay fresh for aboutB days.
A.seven                             
B.thirteen
C.twenty                            
D.twenty-seven
32.The underlined word"allergic"means"A"in Chinese.
A.過敏                              
B.種植
C.發(fā)現(xiàn)                              
D.出售
33.The writer wants to tell us thatC.
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.

分析 太空蔬菜是從種子生長而來的,這些種子被帶到宇宙中,然后再被帶回到地球.種子受到輻射和太空低重力的影響,當它們被帶回地球時,這些種子發(fā)育而來的蔬菜比正常蔬菜更大、更健康.然而,有些人害怕吃太空蔬菜.他們認為空間蔬菜可能對我們不利,這些蔬菜可能會因為接觸過太空輻射而使我們生。欢,人們不應該害怕,因為太空蔬菜非常健康.
這里有一些你應該知道的關于太空蔬菜的事實.
太空蔬菜是由精心挑選的種子發(fā)育而來的.當種子從太空被帶回地球時,人們會對這些種子進行檢測,以確?梢园踩秤茫
太空蔬菜比普通蔬菜對身體更好.例如,太空番茄能夠保鮮20天,比正常番茄長一個星期.
在轉基因食品出現(xiàn)在市場上之后,人們擔心他們正在吃未知的東西.例如,如果將堅果的基因轉移到馬鈴薯里面,對堅果過敏的人可能因吃這些馬鈴薯而感到不適,因為他們不知道在吃土豆的同時也在吃堅果.不像轉基因食品,太空蔬菜在遺傳上沒有改變,這意味著沒有新的基因轉入到蔬菜中.因此,吃未知的蔬菜沒有任何危害.

解答 30.C.細節(jié)理解題.根據(jù)Unlike genetically modified food,space vegetables have not been genetically changed.This means that no new genes are put into the vegetables.可知,與轉基因食品相比,太空蔬菜中沒有引入新的基因,也就是說與太空蔬菜相比,轉基因食品引入了新的基因,也就是發(fā)生了遺傳上的改變,即 genetically changed,因此答案為C.
31.B.推理判斷題.根據(jù)space tomatoes stay fresh for twenty days,which is one week longer than normal tomatoes.可知,太空番茄的保鮮期是20天,這比普通番茄的保鮮期要長一周,因此普通番茄的保鮮期就是20-7(一周的天數(shù))=13天,即thirteen,因此選擇B.
32.A.詞義猜測題.根據(jù)if nut genes(堅果基因)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.可知,使用轉有堅果基因的土豆后,如果某人對堅果allege,那么這個人會生病,因此這個詞能形容人體對堅果中的某種物質產(chǎn)生反應,而出現(xiàn)相應的不舒服或疾病,因此這里選的是過敏;其他的詞語均不符合上面的含義;
33.C.文章主旨題.根據(jù)文章中的內容,首先描述的是太空蔬菜的培育過程,之后說明了太空蔬菜的好處,最后與轉基因食品進行對比,證明太空蔬菜對人體是有好處的,因此通篇文章的主旨就是一點,即太空蔬菜對人體非常好,可以放心食用,因此該題的答案為C.

點評 本文是一篇科普類文章.文章主旨是現(xiàn)階段最受關注的太空蔬菜和轉基因蔬菜的安全.做題時要在理解好文意的基礎上,與題目有機的結合,從文章中找到相關細節(jié)性的句子與選項細細比對,進行選擇或推理判斷,選出符合文章內容的正確選項.做題注意靈活,有時可采用排除法或直選法確定出最終答案.

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