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(2011汕头一模) (1)The human nose is an underestimated tool. Humans are often thought to be __1_insensitive__ smellers compared with animals, but this is largely because, unlike animals, we stand upright. This means that our noses are __2__ to detecting those smells which float through the air, __3_missing__ the majority of smells which stick to surfaces. In fact though, we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of __4_detecting__ human smells even when these are __5_reduced__ to far below one part in one million. 2. A. limited B. committed C. devoted D. conducted 【答案及解析】 A 考查固定短语的意思辨析，be limited to sth.意思是“限制于”，be committed to sth.意思是“有责任做某事”， be devoted to sth.意思是“全身心投入”。 (2)This may also explain why we are not usually sensitive to our own smells we simply do not need to be. We are not __13__ of the usual smell of our own house but we __14_notice__ new smells when we visit someone else's. The brain finds it best to keep smell receptors __15_available__ for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire. 13. A. sure B. sick C. aware D. tired 【答案及解析】 | 
