题目内容

The stems of bamboo are hollow,________ makes them very light.

A.
which
B.
as
C.
that
D.
it

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下面文章中有5处(第61～65题)需要添加小标题。请从以下选项(A、B、C、D、E和F)中选出符合各段意思的小标题。选项中有一项是多余选项。

A. Control of Respiration

B. Basic tips for preserving cut flowers

C. Role of Respiration

D. Most Important Aspect of Flower Care

E. Need for Clean Water

F. Ways of Stopping Respiration

1. __________

????????????? While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts. The key to keeping fresh cut flowers for a week or more without floral preservatives (which contain biocides that kill bacteria and fungus) is to keep the water fresh and the stems free of air pockets so they can continue to draw up water.

2.__________

????????????? An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations(康乃馨) retain their freshness eight times longer when kept at 12℃ than when kept at 26℃. Keeping freshly harvested flowers at the right temperatures is probably the most important aspect of flower care.

3.__________

????????????? Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide, called respiration (呼吸), generates the energy the flower needs to give the flower its shape and color. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.

4. __________

????????????? How, then, to control the rate at which flowers die? By controlling respiration. How is respiration controlled? By controlling temperature. We know that respiration produces heat, but the reverse is also true. Thus by maintaining low temperatures, respiration is reduced and the cut flower will age more slowly.

5. __________

????????????? Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to “drink” water that is dirty or otherwise polluted. Even when water looks and smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach (at 4% solution) be added to each liter of water. The water and solution should also be replaced each day.

根据短文内容, 从下框A~F选项中选出能概括每段主题的最佳选项，并在答题卡上将该选项涂黑。选项中有一项为多余项。

A. Control of respiration

B. Basic tips for preserving cut flowers

C. Role of respiration

D. Most important aspect of flower care

E. Need for clean water

F. Ways of stopping respiration

1.______________

While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts. The key to keeping fresh cut flower for a week or more without preservatives ( which contain biocides (杀虫剂) that kill bacterial and fungus) is to keep the water fresh and the stems free of air pockets so they can continue to draw up water.

2._____________

An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations retain their freshness eight times longer when kept at 12℃ than when kept at 26℃. Keeping freshly harvested flowered at the right temperatures is probably the most important aspect of flower care.

3._____________

The process by which flowers consume oxygen and produce carbon dioxide, called respiration (呼吸), supplies the energy the flower needs to give the flower its shape and color. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.

4.______________

How, then, to control the speed at which flowers die? By controlling respiration. How is respiration controlled? By controlling temperature, we know that respiration produces heat, but the reverse ( 反面 ) is also true. Thus by keeping low temperatures, respiration is reduced and the cut flower will age more slowly.

5._____________

Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to “drink” water that is dirty or otherwise polluted. Even when water looks and smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, chlorine bleach ( 含氯漂白剂 ) can be used in small quantities. It is recommended that 15 drops of chlorine bleach be added to each liter of water. The water and solution （溶液）should also be replaced each day.

When I was young, my father used to grow carnations — a kind of flower that was red, pink or white. He took care of them with much love and devotion. Every day he came home from work, he would enjoy watching them. And he used to tell us, “No one should touch my flowers.”

One day, my younger sister Clemence, who loved dad very much, wanted to help him. So she cut the carnation from their stems（枝干）one by one and arranged them on the ground. She believed that dad would be very pleased to see them that way.

When mom and I realized what my sister had done, we became completely speechless. However, my sister had no idea why no one showed her any appreciation. When dad arrived, he went as usual straight to watch the flowers. Seeing his flowers lying on the ground like dead animals, he was shocked at first. He looked towards the street to see if it was any of the neighbors’ children who could have done it. Then he looked at mom in silence. Finally mom, who always taught us to tell the truth no matter what, said, “No bad neighbors did this great job, only your lovely daughter Clemence.”

Dad’s face changed into a smile and then he said, “Do I have better flower than my lovely daughter?” My younger sister smiled and hugged（拥抱）dad strongly.

1.How did Clemence feel when she had the carnations cut?

A．Lucky. B．Helpful. C．Upset. D．Worried.

2.Which of the following is TRUE according to the passage?

A．No one knew what my sister had done with the carnations.

B．My younger sister told my father the truth about the carnations.

C．Dad had thought one outsider had cut the flowers from the stems.

D．Dad asked my sister to help arrange the carnations on the ground.

3.What caused my younger sister to smile and hug dad strongly?

A．Mom’s help. B．Mom’s words. C．Dad’s silence. D．Dad’s love.

4.Which of the following would be the best title for the passage?

A．My Neighbors B．Telling the truth C．Growing Carnations D．Dad’s Best Flower

When I was young, my father used to grow carnations(康乃馨) ----- a kind of flower which was red, pink and white. He took care of them with much love and devotion. Every day he came back home from work, he would enjoy watching them. Everyone who saw them admired them for their beauty. And he used to tell us, “No one should touch my flowers.”

One day, my younger sister Clemence, who loved dad very much, wanted to help him. So she cut the carnations from their stems(枝干) one by one and arranged them on the ground. She believed that dad would be very pleased to see them that way.

When mom and I realized what my sister had done, we became completely speechless. However, my sister had no idea why no one showed her any appreciation. When my dad arrived, he went straight to see the flowers as usual. Seeing his flowers lying on the ground like dead animals, he was shocked at first. He looked towards the street to see if it was any of the neighbor’s children who could have done it. Then he looked at mom in silence. Finally mom, who always taught us to tell the truth no matter what, said, “No bad neighbors did this great job, only your lovely daughter Clemence.”

Dad’s face changed into a smile and then he said, “Do I have a better flower than my lovely daughter?” My younger sister smiled and hugged dad strongly.

1.Which of the following is TRUE according to the passage?

A．No one knew what my sister had done with the carnations.

B．My younger sister told my father the truth about the carnations.

C．Dad asked my sister to help arrange the carnations on the ground.

D．Dad had thought one outsider had cut the flowers from the stems.

2. How did Clemence feel when she had the carnations cut?

A．Lucky

B．Upset

C．Helpful

D．Worried

3.What caused my younger sister to smile and hug dad strongly?

A．dad’s silence

B．mom’s help

C．dad’s love

D．mom’s words

4.Which of the following would be the best title?

A．Telling the truth	B．Dad’s best flower
C．My neighbors	D．Growing Carnations

Fresh flowers actually continue to grow while in a vase．So in order to keep flowers fresh, you need to consider what the flowers need to grow and stay healthy．Flowers need water, light, and food．Besides, you need to be aware of a few precautions to take．

Distilled water（蒸馏水） is the best kind of water to use for fresh flowers, because there are no chemicals in it．Change the water for your fresh flowers every day or no less than every 2 days to prevent bacteria（细菌） building up．Cut the stems under water again before putting them back in the vase, so that they will be able to draw water up easily．

Keep your fresh flowers out of direct sunlight．At night, put them in the fridge．This will prolong their life．Adding commercial flower food to good water is probably the best method of keeping flowers fresh．Some people put sugar in the water for food．That is OK, but commercial flower food has bacteria-killing ingredients, which can make the water more acidic（酸性的）．If you want a more natural food for your fresh flowers, try water that has been specially treated．That solution will also give the water acidity, sugar, and bacteria-killing ability．

Keep your fresh flowers away from fruit．Fruit gas, or ethylene, will reduce the life of your fresh flowers, making them get older faster．Ethylene is what makes fruit ripen．It is given off by dead flowers, too, so be sure to remove them．

If you follow these tips, your fresh flowers will last a long time and beautify any room in which you put them．

1．What does the underlined word precautions in Paragraph 1 mean?

A．problems that happen to flowers． B．advantages of having flowers．

C．measures taken to prevent problems． D．preparations to grow flowers outside．

2．The fact that distilled water is most beneficial for fresh flowers indicates that ______．

A．distilled water is perfect for people to drink

B．running water shouldn’t be used to water flowers

C．it takes great efforts to keep flowers fresh

D．fresh flowers aren’t used to certain chemicals

3．In order to prolong the life of fresh flowers, you should ______．

A．protect them from direct sunlight during the daytime

B．put them in a damp place at night

C．put them in a fridge all the time

D．put them near water during the daytime

4．Which of the following is the best method of keeping flowers fresh?

A．Cutting the stems under water before putting them back．

B．Using distilled water and commercial flower food．

C．Keeping them away from fruit gas．

D．Watering them with water which contains sugar．

The stems of bamboo are hollow,________ makes them very light.

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