proficiency exam samples - Text 4(Questions 54 – 62 Read...

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Unformatted text preview: Text 4. (Questions 54 – 62) Read the text and choose the best alternative according to the information in it. It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vultures to a dying animal. Researchers with the U.S. Forest Service fastened sensors to the bark of drought-stricken trees and clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50- to 500-kilohertz range. (The unaided human ear can detect no more than 20 kilohertz.) Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood. The scientists think that the vibrations are created when the water columns inside tubes that run the length of the tree break, a result of too little water flowing through them. These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees’ vibrations and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound,” one scientist said. THIS MATERIAL HAS BEEN PRODUCED ONLY FOR PRACTISE PURPOSES. 1 5 5 10 A A A A A A A A A A A A A A A ITU PREP. PROGRAMME PROFICIENCY EXAM JULY 23, 2004 54. Which of the following is the main topic of the passage? a) the vibrations produced by insects b) the mission of the U.S. Forest Service c) the effect of insects on trees d) the sounds made by trees 55 . The word “ them ” in line 3 refers to __________. a) trees b) scientists c) insects d) vultures 56 . The word “ parched ” in line 6 is closest in meaning to __________. a) burned b) dehydrated c) recovered d) reduced 57 . The word “ plight ” in line 6 is closest in meaning to _________. a) cry b) condition c) anger d) struggle 58 . The word “ fractured ” in line 11 is closest in meaning to _________. a) long b) blocked c) hollow d) broken 59 . The word “ they ” in line 12 refers to _________....
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This note was uploaded on 02/26/2012 for the course ENG 101 taught by Professor Osmantanerkır during the Spring '10 term at Princess Sumaya University for Technology.

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proficiency exam samples - Text 4(Questions 54 – 62 Read...

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