學(xué)位英語

Keeping Cut Flowers

1 While everybody enjoys fresh cut flowers around their 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.

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 (二氧化碳), 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 (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 litre of water. The water and solution should also be replaced each day.

1 Paragraph 2_________.

2 Paragraph 3_________.

3 Paragraph 4_________.

4 Paragraph 5_________.

A Control of Respiration

B Beauty of Fresh Cut Flowers

C Role of Respiration

D Most Important Aspect of Flower Care

E Need for Clean Water

F Ways of Stopping Respiration

5 A few simple facts will help you keep cut flowers_________.

6 Respiration plays a key role_________.

7 The aging of cut flowers can be slowed down_________.

8 Another important way to prolong the life of cut flowers is_________.

A by keeping its original shape and color

B in the life of cut flowers

C to produce carbon dioxide

D for as long as possible

E by controlling temperature

F to replace the water and solution every day

【參考答案】

1. D 2. C 3. A 4. E

5. D 6. B 7. E 8. F

報(bào)考條件：綜合類，理工類，衛(wèi)生類考試原則上沒有嚴(yán)格的界限。職稱英語考試報(bào)名可在單位報(bào)，評(píng)職稱與戶口無關(guān)，主要看你的工作單位，所以你可以直接咨詢單位的人事部門，如果他們說可以就行，每個(gè)省規(guī)定不大一樣?！?a title="查看詳情" href="http://m.3swgm8f.cn/zc/48344834015.html" target="_blank" style="color: rgb(0, 0, 255);">查看詳情】

報(bào)考選擇：職稱英語報(bào)考科目|級(jí)別選擇|報(bào)名條件及相關(guān)問題解答

免考規(guī)定：取得外語(從事翻譯工作人員及外語教師第二外語)專業(yè)?？萍耙陨蠈W(xué)歷的人員申報(bào)中、高級(jí)職稱評(píng)審……。【查看詳情】

（責(zé)任編輯：hbz）

共2頁,當(dāng)前第1頁  第一頁  前一頁  下一頁