It is astonishing that so 14 is known about why mosquitoes are drawn to or

It is astonishing that so 14 is known about why

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reaction to its bite, can be. It is astonishing that so (14) …….. is known about why mosquitoes are drawn to or driven away from people, given (15) …….. level of distress and disease caused by these insects. We know that the most effective chemical (16) …….. protecting people against mosquitoes is diethyltoluamide, commonly shortened (17) …….. deet. (18) …….. deet works well, it has some serious drawbacks: it can damage clothes and some people are allergic to it. Scientists know that mosquitoes find some people more attractive than others, but they do not know (19) …….. this should be. They also know that people vary in (20) …….. reactions to mosquito bites. One person has a painful swelling while (21) …….. who is bitten by the same mosquito (22) …….. hardly notice. Scientists have (23) …….. discovered the reason for this, but they have carried (24) …….. experiments to show that mosquitoes are attracted to, or put (25) …….. by, certain smells. In the future, scientists hope to develop a smell that mosquitoes cannot resist. This could be used in a trap (26) …….. that, instead of attacking people, mosquitoes would fly into the trap and be destroyed. For the time (27) …….. however, we have to continue spraying ourselves with unpleasant liquids if we want to avoid getting bitten. PART 3 For questions 28 – 37 , read the text below. Use the word given in capitals at the end of some of the lines to form a word that fits in the gap in the same line . There is an example at the beginning (0). Write your answers IN CAPITAL LETTERS on the separate answer sheet . Example: 0 comparison An ancient tree In Totteridge, in north London, there is a yew tree estimated to be between 1,000 and 2,000 years old. This tree, however, is a mere youngster in
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Công ty phần mềm Cửu Long Dịch vụ thiết kế website,phần mềm CRM 0) …….. with others of the species. The record in the UK is held by a yew in COMPARISON Scotland that is thought to be between 4,000 and 5,000 years old. However, such trees are becoming (28) …….. rare and the Totteridge specimen was INCREASE considered of (29) …….. importance to be named in 1999 as one of the 41 SUFFICE ‘great trees’ in London. Like many yews, the Totteridge tree (30) …….. DOUBT predates the buildings around it and its exact age is unknown. The Totteridge tree needs little (31) …….. . Some of its outer branches hang MAINTAIN down so low that they have taken root. But this is part of the tree’s natural architecture and contributes to its (32) …….. in high winds. With the best of STABLE (33) …….. , ancient yew sites are often tidied up with no benefit to the tree. INTEND Dead branches are not (34) …….. shed by the tree and their wood harbours a READY multitude of insects, an inseparable part of the old tree’s natural (35) …….. DIVERSE Something of the tree’s history is lost with the (36) …….. of dead wood. After REMOVE all, the decaying, twisted and (37) …….. parts give the tree character. ATTRACT PART 4 For questions 38 – 42, think of one word only which can be used appropriately in all three sentences. Here is an example ( 0 ).
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