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C) 阅读短文,根据短文内容选择正确答案。
Teeth have a big job. They help us chew food. They help us talk. Some teeth are
round(圆的). Some are sharp(尖的). We use round back teeth to grind(磨碎) food.
This makes the food easy to swallow(吞咽). We use sharp front teeth to bite into food.
Brushing keeps teeth clean. We should brush teeth in the morning and before bedtime.
We should change our toothbrushes every three months. Visit the dentist twice(两次) a
year. Dentists clean our teeth. They check for cavities. A cavity is a part of a tooth that
is not healthy(健康的). A dentist can fix that. Kids have 20 teeth. They fall out. New
ones grow in. Adults have 28-32 teeth. It is very important to take good care of our
teeth.
(
A. talk B. cook food C. chew food
(
A. nice to eat
B. difficult to eat
C. easy to swallow
(
A. 病痛 B. 牙龈 C. (牙齿的)龋洞
(
A. 32;20 B. 20;28-32 C. 28;30
(
A. Kid's teeth can work for twenty years.
B. Everyone should take good care of his teeth.
C. We should change our toothbrushes twice a year.
Teeth have a big job. They help us chew food. They help us talk. Some teeth are
round(圆的). Some are sharp(尖的). We use round back teeth to grind(磨碎) food.
This makes the food easy to swallow(吞咽). We use sharp front teeth to bite into food.
Brushing keeps teeth clean. We should brush teeth in the morning and before bedtime.
We should change our toothbrushes every three months. Visit the dentist twice(两次) a
year. Dentists clean our teeth. They check for cavities. A cavity is a part of a tooth that
is not healthy(健康的). A dentist can fix that. Kids have 20 teeth. They fall out. New
ones grow in. Adults have 28-32 teeth. It is very important to take good care of our
teeth.
(
B
)1.Teeth can't help us .A. talk B. cook food C. chew food
(
C
)2.We use round back teeth to grind food because this makes the food .A. nice to eat
B. difficult to eat
C. easy to swallow
(
C
)3.The underlined word "cavity" means in Chinese.A. 病痛 B. 牙龈 C. (牙齿的)龋洞
(
B
)4.Kid's teeth fall out. new ones will grow in.A. 32;20 B. 20;28-32 C. 28;30
(
B
)5.Which of the following is RIGHT?A. Kid's teeth can work for twenty years.
B. Everyone should take good care of his teeth.
C. We should change our toothbrushes twice a year.
答案
1.B 2.C 3.C 4.B 5.B
解析
【分析】
这是一篇介绍牙齿相关常识的说明类阅读题，解题时我们可以先通读所有题干，带着问题回到原文逐一定位对应内容：细节题直接找到原文匹配的句子就能选出正确答案，词义猜测题结合单词后的解释说明推导含义，正误判断题逐个核对每个选项和原文内容是否一致，排除错误选项即可得到正确结果，不需要额外主观脑补内容。
【解析】
1. 原文明确提到"They help us chew food. They help us talk."，说明牙齿可以帮助我们咀嚼食物、说话，没有提到可以帮忙做饭，因此选B。
2. 原文对应内容"We use round back teeth to grind(磨碎) food. This makes the food easy to swallow(吞咽)."，直接说明用后牙磨碎食物是为了让食物更容易吞咽，因此选C。
3. 划线单词cavity后文给出解释"A cavity is a part of a tooth that is not healthy"，也就是牙齿上不健康的部分，对应中文含义是（牙齿的）龋洞，A选项范围过宽，B选项牙龈是牙齿周边的健康组织，不符合描述，因此选C。
4. 原文提到"Kids have 20 teeth. They fall out. New ones grow in. Adults have 28-32 teeth."，说明孩子的20颗乳牙会脱落，之后会长出28-32颗恒牙，因此选B。
5. 选项A：原文没有提到孩子的牙齿可以工作20年，表述错误；选项B：文章最后一句"It is very important to take good care of our teeth"说明所有人都应该爱护自己的牙齿，表述正确；选项C：原文说明应该每三个月换一次牙刷，一年需要换4次，不是一年两次，表述错误。因此选B。
【答案】
1.B 2.C 3.C 4.B 5.B
【知识点】
阅读细节定位，词义猜测，信息正误判断
【点评】
本题属于生活化的科普类基础阅读，所有题目的答案都能在原文中找到明确的对应依据，主要考察学生快速查找文本信息的能力，只要认真对照原文内容，不凭自己的主观想法选择，就可以轻松得到正确答案，同时题目内容也能帮助学生了解护牙的相关常识。
【难度系数】
0.8
这是一篇介绍牙齿相关常识的说明类阅读题，解题时我们可以先通读所有题干，带着问题回到原文逐一定位对应内容：细节题直接找到原文匹配的句子就能选出正确答案，词义猜测题结合单词后的解释说明推导含义，正误判断题逐个核对每个选项和原文内容是否一致，排除错误选项即可得到正确结果，不需要额外主观脑补内容。
【解析】
1. 原文明确提到"They help us chew food. They help us talk."，说明牙齿可以帮助我们咀嚼食物、说话，没有提到可以帮忙做饭，因此选B。
2. 原文对应内容"We use round back teeth to grind(磨碎) food. This makes the food easy to swallow(吞咽)."，直接说明用后牙磨碎食物是为了让食物更容易吞咽，因此选C。
3. 划线单词cavity后文给出解释"A cavity is a part of a tooth that is not healthy"，也就是牙齿上不健康的部分，对应中文含义是（牙齿的）龋洞，A选项范围过宽，B选项牙龈是牙齿周边的健康组织，不符合描述，因此选C。
4. 原文提到"Kids have 20 teeth. They fall out. New ones grow in. Adults have 28-32 teeth."，说明孩子的20颗乳牙会脱落，之后会长出28-32颗恒牙，因此选B。
5. 选项A：原文没有提到孩子的牙齿可以工作20年，表述错误；选项B：文章最后一句"It is very important to take good care of our teeth"说明所有人都应该爱护自己的牙齿，表述正确；选项C：原文说明应该每三个月换一次牙刷，一年需要换4次，不是一年两次，表述错误。因此选B。
【答案】
1.B 2.C 3.C 4.B 5.B
【知识点】
阅读细节定位，词义猜测，信息正误判断
【点评】
本题属于生活化的科普类基础阅读，所有题目的答案都能在原文中找到明确的对应依据，主要考察学生快速查找文本信息的能力，只要认真对照原文内容，不凭自己的主观想法选择，就可以轻松得到正确答案，同时题目内容也能帮助学生了解护牙的相关常识。
【难度系数】
0.8
