雅思阅读模拟题之答案详解：滑石粉

　　F If the use of talc in olive oil processing and in chewing gum is long established, new applications in the food and agriculture industries arc also constantly being sought by Luzenac. One such promising new market is fruit crop protection, being pioneered in the US. Just like people, fruit can get sunburned. In fact, in very sunny regions up to 45 per cent of a typical crop can be affected by heat stress and sunburn However, in the case of fruit, it's not so much the ultra violet rays which harm the crop as the high surface temperature that the sun's rays create.

　　G To combat this, farmers normally use either chemicals or spray a continuous fine canopy of mist above the fruit frees or bushes. The trouble is, this uses a lot of water - normally a precious commodity in hot, sunny areas - and it is therefore expensive. What's more, the ground can quickly become waterlogged. "So our idea was to coat the fruit with talc to protect it from the sun," says Greg Hunter, a marketing specialist who has been with Luzenac for ten years. "But to do this, several technical challenges had first to be overcome. Talc is very hydrophobic: it doesn't like water. So in order to have a viable product we needed a wettable powder - something that would go readily into suspension so that it could be sprayed onto the fruit. It also had to break the surface tension of the cutin (the natural waxy, waterproof layer on the fruit) and of course it had to wash off easily when the fruit was harvested. No-one's going to want an apple that's covered in talc."

　　H Initial trials in the state of Washington in 2003 showed that when the product was sprayed onto Granny Smith apples, it reduced their surface temperature and lowered the incidence of sunburn by up to 60 per cent. Today the new product, known as Invelop Maximum SPF, is in its second commercial year on the US market. Apple growers are the primary target although Hunter believes grape growers represent another sector with long term potential. He is also hopeful of extending sales to overseas markets such as Australia, South America and southern Europe.

　　Question 27-32

　　Use the information in the passage to match each use of tale power with correct application from A. B or C. Write the appropriate letters A-C in boxes 27-32 on your answer sheet.

　　NB you may use any letter more than once.

　　A. Fruit protection

　　B. Chewing gum business

　　C. Olive oil extraction

　　27 Talc is used to increase the size of drops.

　　28 Talc is applied to reduce foaming.

　　29 Talc is employed as a filler of base.

　　30 Talc is modified and prevented sunburn.

　　31 Talc is added to stop stickiness.

　　32 Talc is used to increase production.

　　Questions 33-38

　　Complete the following summary of the paragraphs of Reading Passage, using no more than two words from the Reading Passage for each answer. Write your answers in boxes 33-38 on your answer sheet.

　　Spanish olive oil industry has been using talc in oil extraction process for about____33____years. It is useful in dealing with difficult olives which often produce high amount of____34____because of the high content of solid materials. When smaller factories release____35____, it could be____36____to the environment because it is hard to____37____and usually lakes lime as it contains emulsified oil. However, talc power added in the process is able to absorb the emulsifier oil. It improves the oil extraction production, because with aid of talc powder, size of oil____38____increased.

　　Question 39-40

　　Answer the questions below.

　　Choose NO MORE THAN THREE WORDS from the passage for each answer.

　　Write your answers in boxes 39-40 on your answer sheet.

　　39 In which process is talc used to dear the stickiness of chewing gum?

　　40 Which group of farmers does Invelop intend to target in a long view?

　　文章题目：滑石粉

　　篇章结构

试题分析

Question 27-32

题目类型：搭配题

解题思路：可以先去定位A,B,C三个选项中内容所对应的文段，然后从27-32中的题干去搜寻相符合的，而不是一个一个题目去找，这样会比较节省时间