下面文章中有5處(第61～65題)需要添加小標題。請從以下選項(A、B、C、D、E和F)中選出符合各段意思的小標題。選項中有一項是多余選項。

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 (含氯漂白劑) 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.

 

【答案】

1.B

2.D

3.C

4.A

5.E

【解析】

試題分析：文章介紹如何護理保護修剪下來的花的建議，要在適當(dāng)?shù)臏囟刃藜艋ǎ刂苹ǖ暮粑�，還有用清潔的水等。

1.考查段落大意題：從這段的句子：While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible.可知這段講的是：保護修剪下來的花的建議：答案是：B

2.考查段落大意題：從這段的句子：Keeping freshly harvested flowered at the right temperatures is probably the most important aspect of flower care.可知這段講的是：花卉護理的重要方法，答案是：D

3.考查段落大意題：從這段的句子：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.可知這段講的是：呼吸的重要性，答案是：C

4.考查段落大意題：從這段的句子：How, then, to control the speed at which flowers die? By controlling respiration.可知這段講的是：怎么控制呼吸，答案是：A

5.考查段落大意題：從這段的句子：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.可知這段講的是：對清潔的水的需求，答案是：E

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