2. 外语
  3. A rat or pigeon might not be the obvious choice to tend to someone who is sick, but these creatures have some【C1】______ skills t

A rat or pigeon might not be the obvious choice to tend to someone who is sick, but these creatures have some【C1】______ skills t

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问题     A rat or pigeon might not be the obvious choice to tend to someone who is sick, but these creatures have some【C1】______ skills that could help the treatment of human diseases.
    Pigeons are often seen as dirty birds and an urban【C2】______ , but they are just the latest in a long line of animals that have been found to have abilities to help humans. Despite having a brain no bigger than the【C3】______ of your index finger, pigeons have a very impressive【C4】______ memory. Recently it was shown that they could be trained to be as accurate as humans at detecting breast cancer in images.
    Rats are often【C5】______ with spreading disease rather than【C6】______ it, but this long-tailed animal is highly【C7】______ . Inside a rat’s nose are up to 1,000 different types of olfactory receptors (嗅觉感受器), whereas humans only have 100 to 200 types. This gives rats the ability to detect【C8】______ smells. As a result, some rats are being put to work to detect TB (肺结核). When the rats detect the smell, they stop and rub their legs to【C9】______ a sample is infected.
    Traditionally, a hundred samples would take lab technicians more than two days to【C10】______ , but for a rat it takes less than 20 minutes. This rat detection method doesn’t rely on specialist equipment. It is also more accurate—the rats are able to find more TB infections and, therefore, save more lives.
A) associated I) slight
B) examine J) specify
C) indicate K) superior
D) nuisance L) suspicious
E) peak M) tip
F) preventing N) treated
G) prohibiting O) visual H) sensitive
【C8】
选项
答案I
解析 形容词辨析题。空格前为动词detect，空格后为名词smells，由此推测空格处应填入形容词。上文指出，老鼠的鼻子中有多达1，000种不同的嗅觉感受器，可以推断老鼠的嗅觉很强，非常轻微的气味也能探测到，故答案为I)slight“轻微的”。备选项中的其他形容词均不适合修饰smells，故排除。
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大学英语四级

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