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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(芦笋) 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 (农药).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.asparagus 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 本文主要介绍了可以在阴暗处种植,以及如何种植的一些植物.

解答 46.C  主旨大意题.综观全文以及由本文的第一句"Not all vegetables need lots of sunshine."可知本文主要讲述了一些蔬菜可种在遮阴处.
47.C  推理判断题.由第二段Hoffman所说的话"The bottom line here is that most plants will produce more in full sun."可推出阳光会影响一些植物的产量.
48.B  细节理解题.由第三段第五句"It also shows how plants and tree roots can share nutrients and water."可知.
49.C  推理判断题.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不喜阴,可推出这应该是一种昆虫.
   50.A  细节理解题   根据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种植喜阴作物应该考虑特定的情况,故答案为A

点评 1、要想做好科普英语阅读理解题,同学们就要注意平时多读科普知识类文章,学习科普知识,积累常见的科普词汇,从根本上提高科普英语的阅读能力.
2、要熟悉科普类文章的结构特点.科普类文章一般由标题(Head line),导语(Introduction),背景(Back ground),主体(Main body)和结尾(End)五部分构成.标题是文章中心思想高度而又精辟的概括,但根据历年的高考情况来看,这类阅读理解材料一般不给标题,而要同学们选择标题.导语一般位于整篇文章的首段.背景交待一个事实的起因.主体则对导语概括的事实进行详细叙述,这一部分命题往往最多,因此,阅读时,同学们要把这部分作为重点.结尾往往也是中心思想的概括,并与导语相呼应,命题者常在此要设计一道推理判断题.  
3、在进行推理判断时,同学们一定要以阅读材料所提供的科学事实为依据,同时所得出的结论还应符合基本的科普常识.

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