4.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
(61)B
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.
(62)D
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.
(63)C
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.
(64)A
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.
(65)E
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 15drops of chlorine bleach (at 4% solution) be added to each liter of water.The water and solution should also be replaced each day.

分析 本文是一篇科教類(lèi)閱讀,主要講的是如何保存切花.

解答 61-65 BDCAE
61題答案:B 縱觀全文,可知講的是如何保存切花的一些小訣竅;故本題答案為B選項(xiàng).
62題答案:D根據(jù)最后面的…is probably the most important aspect of flower care.(…可能是鮮花護(hù)理最重要的方面),可知本題答案為D選項(xiàng).
63題答案:C根據(jù)最后一句的Thus the greater the level of respiration,the sooner the flower dies.因此呼吸的等級(jí)越高,鮮花死的越快.可知本段講的是"呼吸的作用(影響)",故本題答案為C選項(xiàng).
64題答案:A根據(jù)本段中的By controlling respiration.How is respiration controlled?通過(guò)控制呼吸.呼吸如何控制呢?可知本題答案為A選項(xiàng).
65題答案:E根據(jù)本段中的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.保存切花的另一個(gè)重要因素是水的質(zhì)量.鮮花覺(jué)得"喝"臟水或被污染的水是很困難的.可知本段講的是"切花對(duì)凈水的需求",故本題答案為E選項(xiàng).

點(diǎn)評(píng) 本文是一篇科教類(lèi)閱讀,題目涉及多道細(xì)節(jié)理解題,做題時(shí)結(jié)合原文和題目有針對(duì) 性找出相關(guān)語(yǔ)句進(jìn)行仔細(xì)分析,結(jié)合選項(xiàng)選出正確答案.推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案.

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D.You will get a warning letter from the Transport Department.

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