听力题:2014年12月英语四级听力真题(第二套)短文3

更多
学科 英语四级
发布于
平均得分率 0.5887096774193549
/
1.
They are highly sensitive to cold.
They are vitally important to our life.
They are a living part of our body.
They are a chief source of our pain.
2.
It has to be removed in time by a dentist.
It is a rare oral disease among old people.
It contains many nerves and blood vessels.
It is a sticky and colorless film on the teeth.
3.
It can change into acids causing damage to their outer covering.
It greatly reduces their resistance to the attacks of bacteria.
It makes their nerves and blood vessels more sensitive to acid food.
It combines with food particles to form a film on their surface.
4.
Food particles.
Gum disease.
Unhealthy living habits.
Chemical erosion.
没有评论!快来抢沙发!
发布人
上海 浦东新区
简介:欢迎大家加入四级考试QQ交流群:223426929
下载手机APP,做题更方便!
  
选择题 填空题 判断题 阅读题 听力题 听力填空 翻译题 问答题 完形填空
视频教程 博客教程 录音教程
我们班 学科中心 在线测试 专题订阅
我的订单 个人资料 我的积分 我的头像 修改密码 退出