TEXT K First read the following questions. 89. What is the function of the electrodes mentioned in the passage? A. They detect the clicks sounds. B. They transmit the clicks to the computer. C. They detect electrical activity in the brain. D. They stimulate the auditory nervous system. 90. The function of the computer in this test is _____. A. to amplify electrical signals B. to transform electrical signals into sounds C. to send electrical signals through the earphones D. to transform electrical signals into a printed pattern Now read Text K quickly and select your answers. Until recently, because of the difficulty of testing hearing in a small children, deafness often wasnt detected until a child was about two, too late to prevent a permanent language handicap. Now, however, there is a method to test infants hearing by measuring electrical activity generated by the brain stem in response to sound. Through earphones, an infant is presented with a series of clicking sounds that stimulate the auditory nervous system. The electrical activity thus evoked in the brain is in turn picked up by electrodes placed behind each ear. These electrical signals are amplified, fed into a computer and printed out as waves on a graph. Within 12.5 milliseconds of a click, the graph of a normal baby will show seven distinct peaks, each representing a point along the path the sound has taken from the auditory nerve to the hearing centers of the cortex. For a baby with impaired hearing, peaks take longer to appear. different types of hearing defects, moreover, will produce wave patterns that deviate from the normal characteristic ways. for example, absence of all seven waves indicates total sensory-neural deafness, usually untreatable. In conductive deafness, which can be treated, wave patterns will emerge if the intensity of the sound is increased.

　　89. What is the function of the electrodes mentioned in the passage?

　　A) They detect the clicks sounds.

　　B) They transmit the clicks to the computer.

　　C) They detect electrical activity in the brain.

　　D) They stimulate the auditory nervous system.

　　90. The function of the computer in this test is _____.

　　A) to amplify electrical signals

　　B) to transform electrical signals into sounds

　　C) to send electrical signals through the earphones

　　D) to transform electrical signals into a printed pattern

　　PART V DICTATION

　　Listen to the following passage.    Altogether the passage will be read to you four times.    During the first reading, which will be read at normal speed, listen and try to understand the meaning.    For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds.    The last reading will be read at normal speed again and during this time you should check your work.    You will then be given 2 minutes to check through your work once more.

　　PART VI WRITING

　　Write a composition of about 150 words on the following topic:

　　HOW TO SOLVE THE ENERGY PROBLEM You are to write in three parts. In the first part, state clearly your viewpoint on this issue. In the second part, give one or two reasons to support your point of view. In the last part, bring what you have written to a natural conclusion. Marks will be awarded for content, organization, grammar and appropriacy. Failure to follow these instructions may result in the loss of marks.

　　SECTION B NOTE-WRITING [10 MIN.]

　　Write a note of about 50-60 words based on the following situation: Write a not to your friend explaining your absence from a party you had promised faithfully to go to last weekend. Marks will be awarded for content, organization, grammar and appropriacy.