Planting trees around poultry farms can improve air and water quality -- and relations with neighbors. Research has shown that just three rows of trees near poultry houses can reduce the release of dust and ammonia(氨). They can also reduce the strong smell of ammonia gas.

The trees take dust, ammonia and odors in their leaves. They also provide shade from the sun, so they reduce cooling costs in summer. And they act as a windbreak, so they reduce heating costs in winter. Trees can also improve water quality around farms by removing pollutions from soil and groundwater.

Several years ago, people were objecting to the odor of poultry farms on the Delmarva Peninsula in the eastern United States. Delmarva is where the states of Delaware, Maryland and Virginia come together. Two thousand farms there can each house an average of seventy-five thousand chickens.

Traditionally the farms used windows to provide fresh air in the chicken houses. Farmers rarely planted trees or tall crops around the buildings, so there would be no barrier to the airflow. But then farms began to use new ventilation systems. Instead of windows, the new systems used tunnel fans to circulate air. The fans directed airflow from the poultry houses toward the homes of neighbors.

Researchers began dealing with the problem in two thousand. They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half. And they found that smells were reduced by eighteen percent.

Farmers may think trees will take too long to grow and be effective. But some trees can grow quickly. At least one-third of the Delmarva farms have planted trees, technically known as vegetative environmental buffers. The idea offers a way to cut pollution, save money and energy, and make the neighbors happy.

49. The second paragraph mainly tells us ______.

A. planting trees as much as possible

B. the advantages of trees

C. how to reduce heating costs

D. why trees are received

50. The word “odor” in paragraph 3 means ______.

A. plant        B. smell        C. height       D. water

51. The farms on the Delmarva Peninsula used to use ______ in chicken houses to provide fresh air.

A. trees        B. tunnel fans  C. windows  D. poles

52. It can be learned from the last two paragraphs that ______.

A. three rows of trees are really good to the environment

B. researches began to realize the problem in 2000

C. most farmers show interest in planting trees

D. the trees growing quickly can be cut off in a few years

阅读下在短文,从短文后各题的A、B、C、D四个选项中,选出适合填入对应空白处的最佳选项,并在答题卡上将该选项涂黑。

A woman id her sixties lived alone in her little cottage with a pear tree at her door. She spent all her time taking care of the tree. But the children nearby drover her    21      by making fun of her. They would climb her tree and then run away with pears,     22   “Aunty Misery” at her.

One evening, a passer by asked to    23     for the night. Seeing that he had an   24   Face, she let him in and gave him a nice    25   . The next morning the stranger, actually a sorcerer (巫师), thanked her by granting (允准) her   26     that anyone who climbed up her tree  27   not be able to come back down until she   28  it.

 When the children came back to steal her   29   , she had them stuck on the tree. They had to beg her

long   30   she gave the tree permission to let  31    go. Aunty Misery was free from the   32   at last.

One day another man    33    her door. This one did not look trustworthy to her,   34   she asked who he was . “I am Death, I’ve come to take you   35    me.” said he.

Thinking fast Aunty Misery said, “Fine, but I’d like to  36    some pears from my dear tree to remember the 37          

it brought to me in this life. But I am too    38   to climb high to get the best fruit. Will you be so   39    as to do it for me?” With a deep sigh, Mr. Death climbed up the tree   40   and was immediately stuck to it. No matter how much he warned or begged, Aunty Misery would not allow the tree to let Death go.

21.  A. hopeless    B. painful    C. dull   D. crazy

22.  A. calling     B. shouting   C. announcing        D. whispering

23.  A. stay        B. live       C. hide              D. lie

24.  A. interesting B. honest     C. anxious           D. angry

25.  A. gift        B. kiss       C. treat             D. smile

26.  A. suggestion  B. demand     C. permission        D. wish

27.  A. could       B. should     C. might             D. must

28.  A. permitted   B. promised   C. answered          D. declared

29.  A. branch     B. food        C. tree              D. fruit

30.  A. after      B. while       C. since             D. before

31.  A. it         B. them        C. him               D. her

32.  A. trick      B. question    C. trouble           D. difficulty

33.  A. stepped into   B. left for C. stopped at       D. walked around

34.  A. so        B. but           C. although         D. because

35.  A. with      B. off           C. upon             D. for

36.  A. choose    B. pick          C. shake            D. hit

37.  A. honor     B. pleasure      C. hope             D. excitement

38.  A. light     B. short         C. old              D. thin

39.  A. proud     B. kind          C. fine             D. smart

40.  A. disappointedly       B. cheerfully      C. unwillingly     D. eagerly

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