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
【C4】
选项
答案O
解析 形容词辨析题。空格前为形容词impressive，空格后为名词memory，因此此处应填入形容词修饰memory，指某类记忆。结合下文句意，鸽子能够被训练地和人类一样能精确地通过图像检测乳腺癌，可见鸽子的视觉优势比较明显，故O)visual“视觉的”为答案。备选形容词中，H)sensitive、I)slight和L)suspicious均不符合句意，故排除。
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大学英语四级

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