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
【C3】
选项
答案M
解析 名词辨析题。空格前为冠词the，后面是介词of，可以推测此处应填入名词，且该词与of后面的index finger有关。该句是在描述鸽子脑子的大小，指出其不大于人类食指的某部分，选项中只有M)tip“尖端，末梢”符合此处的含义，故为答案。剩余的备选名词E)peak“顶点”，不能用来描述手指的尖端部位，故排除。
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大学英语四级

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