2017年12月四六级真题答案※ 微信对答案 ※ 万题库估分

　　备注：本试题(答案)由网友提供，考试吧收集发布，仅供参考!

　　“考试采取“多题多卷”模式，试题顺序不统一，请依据试题进行核对。”

　　Part Ⅲ 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.

扫描/长按二维码可获取四六级真题答案

获取2017四级真题答案

获取2017六级真题答案

获取四六级成绩查询

获取2018一次通关技巧

四六级万题库下载 | 微信搜索"万题库英语四六级考试"

　　相关推荐：

　　2017年12月英语四六级真题及答案解析※ 关注微信，对答案看解析！

　　四六级评分标准 ※ 最新算分器 ※ 英语四六级万题库估分[手机题库下载]

　　2017年12月四六级成绩查询时间 ※ 微信查分提醒 ※ 四六级合格分数线