2017年12月英语四级考试真题及答案2（第1套）

PartⅢ Reading Comprehension(40 minutes)

Section A

Directions:In this section,there is a passage with ten blanks.You are required to select one word for each blank from a list of choices given in a word bank following the passage.Read the passage through carefully before making your choices.Each choice in the bank is identified by a letter.Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre.You may not use any of the words in the bank more than once.

A rat or pigeon might not be the obvious choice to tend to someone who is sick,but these creatures have some 26 skills that could help the treatment of human diseases.

Pigeons are often seen as dirty birds and an urban 27,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 28 of your index finger,pigeons have a very impressive 29 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 30 with spreading disease rather than 31 it,but this long-tailed animal is highly 32.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 33 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 34 a sample is infected.

Traditionally,a hundred samples would take lab technicians more than two days to 35,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

B)examine

C)indicate

D)nuisance

E)peak

F)preventing

G)prohibiting

H)sensitive

I)slight

J)specify

K)superior

L)suspicious

M)tip

N)treated

O)visual

【参考答案】

26-35：KDMOA FHICB

【参考译文】

老鼠或鸽子可能不是照顾生病的人的明显选择，但这些生物有26种技能可以帮助治疗人类疾病。

鸽子通常被视为肮脏的鸟类和城市27，但它们只是最近发现的一长串有能力帮助人类的动物之一。尽管鸽子的大脑不比食指的28大，但它们的记忆力却令人印象深刻。最近的研究表明，它们可以被训练成和人类一样精确地在图像中检测乳腺癌。

老鼠通常是30岁而不是31岁，但这种长尾动物高度32岁。在鼠的鼻子多达1000种不同类型的嗅觉受体(嗅觉感受器),而人类只有100到200种。这使得老鼠能够识别33种气味。因此,一些老鼠正在工作检测结核(肺结核)。当老鼠察觉到这种气味时，它们就会停下来，揉着腿，直到34个样本被感染。

传统上，100个样本需要实验室技术人员两天到35天的时间，但对一只老鼠来说，这需要不到20分钟的时间。这种老鼠检测方法不依赖于希赛网设备。它也更准确——老鼠能够发现更多的结核病感染，从而拯救更多的生命。

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2017年12月英语四级考试真题及答案汇总（第1套）