英语四级 2022年6月·第1套 Part III Section A 完形填空（选词填空）试卷排版
英语四级2022年6月·第1套 Part III Section A 完形填空（选词填空）：共 10 题、占整卷 5%（710 分制折算约 36 分）、卷面选文共 247 个英文单词。本页按真题原卷版式还原该模块卷面（不含解析）；逐题解析在「题目解析」页，全文逐句精读在「原文精读」页；本模块真题可免费下载 PDF/Word，入口见上方本题行。
试卷原卷
真题卷第1套(2022-06) • 四级
Part III 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.
You might think of your teeth as tools, like built-in knives and forks, but if they are mere tools, why do they feel pain and wouldn't it be better if they could just 26 under any condition? In spite of our 27 discomfort, it turns out there's a good reason our teeth are so sensitive. Tooth pain is a 28 mechanism that ensures when a tooth is being damaged we'll notice and do something about it.
If we eat something too hot or too cold, or if the tooth is worn down enough where the tissue 29 is exposed, all of those things cause pain, and then the pain causes the person not to use that tooth to try to protect it a little bit more. So it's really a protective mechanism more than anything else. If teeth didn't feel pain, we might 30 to use them in situations that damage them, and for humans, damaging 31 teeth is a problem because, unlike crocodiles, we can't 32 them.
Teeth have three layers, only one of which—the innermost layer of the tooth—can hurt, as that layer of the tooth 33 both blood vessels and nerves. Pain is the only feeling to which the nerves in that layer respond. Whereas people with tooth sensitivity may complain, for example, of tooth pain 34 by heat or cold, the nerves in the inner layer don't sense temperature. Rather, they feel pain, which may be 35 with, say, drinking something very cold.
A)adult
B)associated
C)chew
D)contains
E)continue
F)defense
G)dental
H)downward
I)emotional
J)implies
K)mammal
L)replace
M)swallow
N)triggered
O)underneath
选文出处：本文选自2020年1月26日发表在 www.livescience.com(生活科学网站)上的一篇标题为“Why are teeth so sensitive to pain?”(《为什么牙齿对疼痛如此敏感?》)的文章。