题目内容
_______________ otherwise you will miss the first bus.
- A.Hurry up
- B.If you don't hurry up
- C.Unless you hurry up
- D.If you hurry up
解析：
这是一个固定句型，即由一个祈使句+and, or或otherwise+陈述句构成。祈使句表示原因、条件，后面的陈述句表示结果。
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A, B, C, D, E(AB), F(AC)
| 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 |
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.
【小题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.
【小题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 colour. 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.
【小题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.
【小题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 litre of water. The water and solution should also be replaced each day.
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
Taking good notes is a time-saving skill that will help you to become a better student in several ways. 71 Second, your notes are excellent materials to refer to when you are studying for a test. Third, note-taking offers variety to your study time and helps you to hold your interest .
You will want to take notes during classroom discussions and while reading a textbook or doing research for a report. 72 Whenever or however you take notes, keep in mind that note-taking is a selective process（挑选的过程）. 73．
The following methods may work best for you.
●Read the text quickly to find the main facts and ideas in it.
●Carefully read the text and watch for words that can show main points and supporting facts.
●Write your notes in your own words.
● 74．
●Note any questions or ideas you may have about what was said or written.
As you take notes, you may want to use your own shorthand(速记). When you do, be sure that you understand your symbols and that you use them all the time. 75．
| A. Use words, not complete sentences. B. There are three practical note-taking methods. C. You must write your notes on separate paper. D. Otherwise, you may not be able to read your notes later. E. you will also want to develop your own method for taking notes. F. That means you must first decide what is important enough to include in your notes. G. First, the simple act of writing something down makes it easier for you to understand and remember it. |