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
【C7】
选项
答案H
解析 形容词辨析题。空格前为副词highly，故此处应填入形容词。结合句意，but前指出老鼠通常是传播疾病的，为贬义，故but后的句意应为褒义，同时结合后文，老鼠的鼻子中有多达1，000种不同的嗅觉感受器，因此此处应该表达老鼠“灵敏度高”的意思，H)sensitive意为“敏感的”，符合句意，故为答案。备选项中无剩余褒义词汇，故均排除。
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大学英语四级

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