五、阅读理解。
Do you think of white when someone talks about a polar bear? In fact, the polar bear does not have white fur. It just seems to be white. Polar bears have a very good sense of smell. It helps them find food. During summer, polar bears sleep longer in the day, because they are able to find their food more easily at night. Usually, after a meal, polar bears have a short sleep. A polar bear can have 2-3 babies at a time. They live with their mothers until they are about two and a half years old.
However, polar bears will die out soon because of people. There are only 20,000 to 25,000 polar bears in the world. Those polar bears are trying to survive(生存) today. The number of them is becoming smaller and smaller because of the loss of sea ice—polar bears mostly live on the sea ice, not land ice. This is happening because of global warming. Besides, they also have to face pollution, being hunted and so on.
Some people don't care, but other people want to save polar bears. Join them and try to make the world a better place for those beautiful and lovely animals.
(
A. A good sense of touch.
B. A good sense of hearing.
C. A good sense of sight.
D. A good sense of smell.
(
A. Pollution and global warming.
B. Lack of sleep and being hunted.
C. Lack of food and the loss of land ice.
D. A bad sense of smell and pollution.
(
A. Polar bears' fur is white.
B. Polar bears can have more than three babies at a time.
C. Polar bears have a good, happy life.
D. It's easier for polar bears to find food at night in summer.
Do you think of white when someone talks about a polar bear? In fact, the polar bear does not have white fur. It just seems to be white. Polar bears have a very good sense of smell. It helps them find food. During summer, polar bears sleep longer in the day, because they are able to find their food more easily at night. Usually, after a meal, polar bears have a short sleep. A polar bear can have 2-3 babies at a time. They live with their mothers until they are about two and a half years old.
However, polar bears will die out soon because of people. There are only 20,000 to 25,000 polar bears in the world. Those polar bears are trying to survive(生存) today. The number of them is becoming smaller and smaller because of the loss of sea ice—polar bears mostly live on the sea ice, not land ice. This is happening because of global warming. Besides, they also have to face pollution, being hunted and so on.
Some people don't care, but other people want to save polar bears. Join them and try to make the world a better place for those beautiful and lovely animals.
(
D
)1. What do polar bears have?A. A good sense of touch.
B. A good sense of hearing.
C. A good sense of sight.
D. A good sense of smell.
(
A
)2. According to the passage, what problems are polar bears facing?A. Pollution and global warming.
B. Lack of sleep and being hunted.
C. Lack of food and the loss of land ice.
D. A bad sense of smell and pollution.
(
D
)3. What can we learn from the passage?A. Polar bears' fur is white.
B. Polar bears can have more than three babies at a time.
C. Polar bears have a good, happy life.
D. It's easier for polar bears to find food at night in summer.
答案：1. D 【点拨】根据“Polar bears have a very good sense of smell.”可知，北极熊有很好的嗅觉。故选D。
2. A 【点拨】根据“This is happening because of global warming. Besides, they also have to face pollution, being hunted and so on.”可知，北极熊面临着全球变暖、污染、被猎杀等问题。故选A。
3. D 【点拨】根据“During summer, polar bears sleep longer in the day, because they are able to find their food more easily at night.”可知，在夏天，北极熊在晚上更容易找到食物。故选D。
2. A 【点拨】根据“This is happening because of global warming. Besides, they also have to face pollution, being hunted and so on.”可知，北极熊面临着全球变暖、污染、被猎杀等问题。故选A。
3. D 【点拨】根据“During summer, polar bears sleep longer in the day, because they are able to find their food more easily at night.”可知，在夏天，北极熊在晚上更容易找到食物。故选D。
解析：
【分析】
这是一篇科普类细节型阅读理解，解题时可以用题干关键词定位法快速解题：首先浏览每道题的题干，划出核心关键词，之后带着关键词回到原文对应段落查找匹配的原文内容，再将选项内容和原文表述逐一比对，排除和原文不符的错误选项，就能得到正确答案。三道题均不需要复杂推理，全部可以通过定位原文直接找到答题依据。
【解析】
1. 定位原文第一段内容"Polar bears have a very good sense of smell."，可知北极熊拥有非常敏锐的嗅觉，选项A的良好触觉、B的良好听觉、C的良好视觉在原文中均无相关表述，因此排除ABC，选D。
2. 定位原文第二段内容，文中明确提到北极熊的生存危机来自全球变暖导致的海冰消融，除此之外还要面对污染、被猎杀等问题。逐一核对选项：B选项的“睡眠不足”原文无提及，C选项的“陆地冰缺失”和原文表述的“海冰减少”不符，D选项的“嗅觉差”和原文表述完全相反，只有A选项的“污染和全球变暖”属于北极熊面临的问题，因此选A。
3. 逐一核对每个选项和原文内容：A选项和原文第一段"the polar bear does not have white fur"表述矛盾；B选项和原文" A polar bear can have 2-3 babies at a time"表述矛盾；C选项和第二段提到北极熊濒临灭绝、生存艰难的内容矛盾；D选项和原文第一段"During summer, polar bears sleep longer in the day, because they are able to find their food more easily at night"表述完全一致，因此选D。
【答案】
1. D 2. A 3. D
【知识点】
阅读理解细节定位，科普类短文阅读
【点评】
本题属于低难度的科普类阅读题，所有题目均为细节理解类题型，没有设置干扰性极强的迷惑选项，学生只要掌握回原文定位找依据的阅读解题方法，认真比对选项和原文的表述差异，就可以顺利得分，同时题目内容也能帮助学生了解北极熊的生存现状，建立保护濒危动物的意识。
【难度系数】
0.8
这是一篇科普类细节型阅读理解，解题时可以用题干关键词定位法快速解题：首先浏览每道题的题干，划出核心关键词，之后带着关键词回到原文对应段落查找匹配的原文内容，再将选项内容和原文表述逐一比对，排除和原文不符的错误选项，就能得到正确答案。三道题均不需要复杂推理，全部可以通过定位原文直接找到答题依据。
【解析】
1. 定位原文第一段内容"Polar bears have a very good sense of smell."，可知北极熊拥有非常敏锐的嗅觉，选项A的良好触觉、B的良好听觉、C的良好视觉在原文中均无相关表述，因此排除ABC，选D。
2. 定位原文第二段内容，文中明确提到北极熊的生存危机来自全球变暖导致的海冰消融，除此之外还要面对污染、被猎杀等问题。逐一核对选项：B选项的“睡眠不足”原文无提及，C选项的“陆地冰缺失”和原文表述的“海冰减少”不符，D选项的“嗅觉差”和原文表述完全相反，只有A选项的“污染和全球变暖”属于北极熊面临的问题，因此选A。
3. 逐一核对每个选项和原文内容：A选项和原文第一段"the polar bear does not have white fur"表述矛盾；B选项和原文" A polar bear can have 2-3 babies at a time"表述矛盾；C选项和第二段提到北极熊濒临灭绝、生存艰难的内容矛盾；D选项和原文第一段"During summer, polar bears sleep longer in the day, because they are able to find their food more easily at night"表述完全一致，因此选D。
【答案】
1. D 2. A 3. D
【知识点】
阅读理解细节定位，科普类短文阅读
【点评】
本题属于低难度的科普类阅读题，所有题目均为细节理解类题型，没有设置干扰性极强的迷惑选项，学生只要掌握回原文定位找依据的阅读解题方法，认真比对选项和原文的表述差异，就可以顺利得分，同时题目内容也能帮助学生了解北极熊的生存现状，建立保护濒危动物的意识。
【难度系数】
0.8