2005年Use of English

Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points)

   The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, 1_____ this is largely because, 2_____ animals, we stand upright. This means that our noses are 3______ to perceiving those smells which float through the air, 4______ the majority of smells which stick to surfaces. In fact 5_____, we are extremely sensitive to smells, 6_____  we do not generally realize it. Our noses are capable of 7_____  human smells even when these are 8_____  to far below one part in one million.

　　Strangely, some people find that they can smell one type of flower but not another, 9_____  others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate 10_____  smell receptors in the nose. These receptors are the cells which sense smells and send 11_____  to the brain. However, it has been found that even people insensitive to a certain smell 12_____  can suddenly become sensitive to it when 13_____  to it often enough.

　　The explanation for insensitivity to smell seems to be that brain finds it 14_____  to keep all smell receptors working all the time but can 15_____  new receptors if necessary. This may 16_____  explain why we are not usually sensitive to our own smells we simply do not need to be. We are not 17_____  of the usual smell of our own house but we 18_____  new smells when we visit someone else's. The brain finds it best to keep smell receptors 19_____  for unfamiliar and emergency signals 20_____  the smell of smoke, which might indicate the danger of fire.

1. [A]although      [B]as         [C]but        [D]while

　　2. [A]above        [B]unlike      [C]excluding  [D]besides

　　3. [A]limited       [B]committed   [C]dedicated  [D]confined

　　4. [A]catching      [B]ignoring    [C]missing    [D]tracking

　　5. [A]anyway       [B]though     [C]instead    [D]therefore

　　6. [A]even if        [B]if only     [C]only if     [D]as if

　　7. [A]distinguishing  [B]discovering  [C]determining[D]detecting

　　8. [A]diluted        [B]dissolved   [C]determining [D]diffused

　　9. [A]when         [B]since      [C]for         [D]whereas

　　10.[A]unusual       [B]particular  [C]unique      [D]typical

　　11.[A]signs         [B]stimuli    [C]messages    [D]impulses

　　12.[A]at first        [B]at all      [C]at large     [D]at times

　　13.[A]subjected     [B]left        [C]drawn      [D]exposed

　　14.[A]ineffective    [B]incompetent [C]inefficient   [D]insufficient

　　15.[A]introduce     [B]summon    [C]trigger     [D]create

　　16.[A]still          [B]also       [C]otherwise   [D]nevertheless

　　17.[A]sure         [B]sick        [C]aware      [D]tired

　　18.[A]tolerate      [B]repel       [C]neglect      [D]notice

　　19.[A]available     [B]reliable     [C]identifiable   [D]suitable

　　20.[A]similar to     [B]such as     [C]along with   [D]aside from