专四专八考试

解析:The human nose is an underrated too

来源:网考网专四专八 所有评论

【单选题】The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, (31) this is largely because, (32) animals, we stand upright. This means that our noses are (33) to perceiving those smells which float through the air, (34) the majority of smells which stick to surfaces. In fact, (35) , we are extremely sensitive to smells, (36) we do not generally realize it. Our noses are capable of (37) human smells even when these are (38) to far below one part in one million.
Strangely, some people find that they can smell one type of flower but not another, (39) others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate (40) smell receptors in the nose. These receptors are the cells which sense smells and send (41) to the brain. However, it has been found that even people insensitive to a certain smell (42) can suddenly become sensitive to it when (43) to it often enough.
The explanation for insensitivity to smell seems to be that the brain finds it (44) to keep all smell receptors working all the time but can (45) new receptors if necessary. This may (46) explain why we are not usually sensitive to our own smells—we simply do not need to be. We are not (47) of the usual smell of our own house, but we (48) new smells when we visit someone else’s. The brain finds it best to keep smell receptors (49) for unfamiliar and emergency signals (50) the smell of smoke, which might indicate the danger of fire.
A.distinguishing
B.discovering
C.determining
D.detecting

网考网参考答案:D
网考网解析:

[解析] 此处空格用来描述在某种条件下,我们的鼻子能对气味做出怎样的反应。因此D项detecting(发现,察觉出)符合题意。 [点睛] 词义辨析题。B项discovering常用于指探索或揭示某种已存在的客观事实,C项determining意为“确定,测定”,均不符合题意。A项distinguishing有“区别”的意思,但此处并非讨论鼻子可以分辨出不同气味的功能,而只是描述鼻子可以感知某种气味。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>

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