30.The human nose is an understated tool. Humans are often thought to be insensitive smellers compared with animals, but this is largely because, ## animals, we stand upright. This means that our noses are limited to perceiving those smells that float through the air, ##the majority of smells which stick to surfaces. In fact though, we are extremely sensitive to smell, ##we do not generally realize it. Our noses are capable of detecting human smells even when these are ## to far below one part in one million. Strangely, some people find that they can smell one type of flower but not another, whereas others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate ## smell receptors in the nose. These receptors are the cells which sense smells and send messages to the brain. However, it has been found that even people insensitive to a certain smell ## can suddenly become sensitive to it when exposed to it often enough. The explanation for insensitivity to smell seems to be that brain finds it## to keep all smell receptors working all the time but can create new receptors if necessary. This may ##explain why we are not usually sensitive to our own smells we simply do not need to be. We are not aware of the usual smell of our own house but we ##new smells when we visit someone else’s. The brain finds it best to keep smell receptors available for unfamiliar and emergency signals ## the smell of smoke, which might indicate the danger of fire.
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(1).
A.above
B.unlike
C.excluding
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D.besides
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(2).
A.catching
B.ignoring
C.missing
D.tracking
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(3).
A.even if
B.if only
C.only if
D.as if
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(4).
A.diluted
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B.dissolved
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C.determining
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D.diffused
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(5).
A.unusual
B.particular
C.unique
D.typical
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(6).
A.at first
B.at all
C.at large
D.at times
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(7).
A.ineffective
B.incompetent
C.inefficient
D.insufficient
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(8).
A.still
B.also
C.otherwise
D.nevertheless
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(9).
A.tolerate
B.repel
C.neglect
D.notice
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(10).
A.similar to
B.such as
C.along with
D.aside from
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四、客观填空题 (共 5 道试题,共 40 分)
31.有了他的帮助，我们就没有其它什么可担心的了。##
32.老板告诉我们这项工作必须在圣诞节前完成。##
33.我们必须努力学习，，否则就无法通过考试。##
34.昨天我去拜访他，看看他是否能解决这个问题。##
