1.Not all vegetables need lots of sunshine.Mark Hoffman and his wife,Guia,own a bed-and-breakfast guesthouse in rural Kempton,Illinois.They often serve their guests produce fresh from the garden.
The Hoffmans have been growing food and flowers for twenty-five years.For almost ten of those years,Mr.Hoffman has been experimenting and working with shade plantings.He says visitors to his website-greenhousebed.com-often ask how to plant in shade spaces.He said,"The bottom line here is that most plants will produce more in full sun.But if you do not have full sun,there are other options."
For example,he grows tomatoes near oak trees.Oak trees can produce a lot of shade.But Mr.Hoffman says his tomato plants grow as long as they get five hours a day of direct sunshine,especially morning sun.Not only does this go against the traditional advice that tomatoes need six,eight,even twelve hours a day of full sun,it also shows how plants and trees roots can share nutrients and water.Mr.Hoffman also planted asparagus(蘆筍) around a tree at its drip line,the area below the outer limit of the branches.So when it rains,all the rain drips down right on the asparagus.
The Hoffmans'website includes a list of vegetables,flowers and herbs that have produced acceptably for them in partial shade.Mr.Hoffman says plants with wider leaves seem to do better in shady environments.He also found that his potatoes did better in partial shade than in full sun.
Moving them out of the sun helped control an insect problem with leaf hoppers.Mr.Hoffman does not use pesticides (農(nóng)藥).Instead,he planted the potatoes at the drip line,especially on the east side of the tree.The potatoes get morning sun,but they are shaded during the hottest part of the day.Leaf hoppers dislike shade,and the hottest part of the day is when they do the worst of their damage.
Time of day,brightness of the sun,shadows from trees,walls and buildings,these all influence how much sunlight falls or does not fall on plants.And extension agent Curtis Swift at Colorado State University says people interested in shade planting should also remember something else.The term"shade"can describe different amounts of darkness.He says it can even mean different things in different parts of the world.

46.What's the author's purpose of writing the passageC?
A.To present a kind of eco-friendly lifestyle.
B.To recommend an approach to managing a website.
C.To show vegetables can be planted in the shade.
D.To introduce Mark Hoffman and his family.
47.What can we infer from the second paragraphC?
A.Food and flowers produce more in the shade.
B.Food growing in the shade contains more nutrients.
C.Sun can affect the production of some plants.
D.Food growing in the shade is the best choice for most plants.
48.By using asparagus as an example,the author wants to explain thatB.
A.a(chǎn)sparagus prefers to grow in the shade
B.how plants and tree roots share water
C.vegetables grow better in partial shade
D.how leaves gain sunshine under the tree
49.The underlined words"leaf hoppers"in Para.5may be a kind ofC.
A.plants         
B.pesticides         
C.insects         
D.potatoes
50.According to the passage,Curtis Swift may think thatA.
A.people should consider specific situation while planting vegetables in shade
B.some special rules related to shade plantings should be remembered
C.different parts of the world should plant different kinds of vegetables in shade
D.shade planting is influenced by different kinds of soil condition.

分析 本文主要介紹了可以在陰暗處種植,以及如何種植的一些植物.

解答 46.C  主旨大意題.綜觀全文以及由本文的第一句"Not all vegetables need lots of sunshine."可知本文主要講述了一些蔬菜可種在遮陰處.
47.C  推理判斷題.由第二段Hoffman所說的話"The bottom line here is that most plants will produce more in full sun."可推出陽光會影響一些植物的產(chǎn)量.
48.B  細(xì)節(jié)理解題.由第三段第五句"It also shows how plants and tree roots can share nutrients and water."可知.
49.C  推理判斷題.由第五段第一句"Moving them out of the sun helped control an insect problem with leaf hoppers."以及本段后面提到leaf hoppers不喜陰,可推出這應(yīng)該是一種昆蟲.
   50.A  細(xì)節(jié)理解題   根據(jù)And extension agent Curtis Swift at Colorado State University says people interested in shade planting should also remember something else.The term"shade"can describe different amounts of darkness.He says it can even mean different things in different parts of the world.可知,Curtis Swift種植喜陰作物應(yīng)該考慮特定的情況,故答案為A

點(diǎn)評 1、要想做好科普英語閱讀理解題,同學(xué)們就要注意平時(shí)多讀科普知識類文章,學(xué)習(xí)科普知識,積累常見的科普詞匯,從根本上提高科普英語的閱讀能力.
2、要熟悉科普類文章的結(jié)構(gòu)特點(diǎn).科普類文章一般由標(biāo)題(Head line),導(dǎo)語(Introduction),背景(Back ground),主體(Main body)和結(jié)尾(End)五部分構(gòu)成.標(biāo)題是文章中心思想高度而又精辟的概括,但根據(jù)歷年的高考情況來看,這類閱讀理解材料一般不給標(biāo)題,而要同學(xué)們選擇標(biāo)題.導(dǎo)語一般位于整篇文章的首段.背景交待一個(gè)事實(shí)的起因.主體則對導(dǎo)語概括的事實(shí)進(jìn)行詳細(xì)敘述,這一部分命題往往最多,因此,閱讀時(shí),同學(xué)們要把這部分作為重點(diǎn).結(jié)尾往往也是中心思想的概括,并與導(dǎo)語相呼應(yīng),命題者常在此要設(shè)計(jì)一道推理判斷題.  
3、在進(jìn)行推理判斷時(shí),同學(xué)們一定要以閱讀材料所提供的科學(xué)事實(shí)為依據(jù),同時(shí)所得出的結(jié)論還應(yīng)符合基本的科普常識.

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