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情境3 你认识招潮蟹吗？它有什么有趣的习性？在海滩偶遇这种奇特螃蟹时，
答案
答案略
解析
【分析】
这是一道结合滨海自然场景的科普类情境题，解题时首先可以从招潮蟹的外形特征、活动规律入手梳理它的趣味习性，再结合户外观察的场景，给出偶遇该生物时的合理行为指引，既保证内容的科普准确性，也符合生态保护的基本要求。
【解析】
1. 招潮蟹的趣味习性：
① 外形特征特殊：雄性招潮蟹拥有一只远大于另一只的巨型螯足，大螯可用于求偶展示、同类争斗防御，雌性招潮蟹的两只螯足大小对称，都用于取食；
② 活动节律和潮汐完全同步：招潮蟹的生物钟和潮汐周期高度匹配，涨潮前它们会提前退回自己挖掘的滩涂洞穴中躲避，退潮后才会出洞活动，在滩涂上取食藻类、有机碎屑；
③ 体色会随时间变化：招潮蟹的体表颜色会跟随昼夜节律发生改变，白天体色更深，夜间体色会明显变浅，节律十分稳定。
2. 海滩偶遇招潮蟹的正确做法：
不要随意惊扰、抓捕招潮蟹，保持合适距离安静观察即可，避免踩踏潮间带滩涂破坏招潮蟹的栖息洞穴，不要随意向滩涂丢弃垃圾，主动保护滨海潮间带的生态环境。
【答案】
答案略
【知识点】
潮间带生物习性，滨海生态保护
【点评】
本题将生物科普知识和户外自然观察场景结合，兼具趣味性和科普引导性，既可以拓展学生的自然常识储备，也能帮助学生建立正确的生态保护观念，引导学生学会科学观察野生生物。
【难度系数】
0.7
这是一道结合滨海自然场景的科普类情境题，解题时首先可以从招潮蟹的外形特征、活动规律入手梳理它的趣味习性，再结合户外观察的场景，给出偶遇该生物时的合理行为指引，既保证内容的科普准确性，也符合生态保护的基本要求。
【解析】
1. 招潮蟹的趣味习性：
① 外形特征特殊：雄性招潮蟹拥有一只远大于另一只的巨型螯足，大螯可用于求偶展示、同类争斗防御，雌性招潮蟹的两只螯足大小对称，都用于取食；
② 活动节律和潮汐完全同步：招潮蟹的生物钟和潮汐周期高度匹配，涨潮前它们会提前退回自己挖掘的滩涂洞穴中躲避，退潮后才会出洞活动，在滩涂上取食藻类、有机碎屑；
③ 体色会随时间变化：招潮蟹的体表颜色会跟随昼夜节律发生改变，白天体色更深，夜间体色会明显变浅，节律十分稳定。
2. 海滩偶遇招潮蟹的正确做法：
不要随意惊扰、抓捕招潮蟹，保持合适距离安静观察即可，避免踩踏潮间带滩涂破坏招潮蟹的栖息洞穴，不要随意向滩涂丢弃垃圾，主动保护滨海潮间带的生态环境。
【答案】
答案略
【知识点】
潮间带生物习性，滨海生态保护
【点评】
本题将生物科普知识和户外自然观察场景结合，兼具趣味性和科普引导性，既可以拓展学生的自然常识储备，也能帮助学生建立正确的生态保护观念，引导学生学会科学观察野生生物。
【难度系数】
0.7
任务1 阅读表达
One sunny afternoon, I went for a walk on the beach. There I saw a special crab(螃蟹). It had two claws(螯). One claw was much bigger and longer than the other. I had never seen such a crab before. So on my way home from the beach, I walked into the library.
Luckily, I found a book named Come with Me to the Edge of the Sea. It had many pictures of animals living near the sea. The pictures of male fiddler crabs (雄性招潮蟹) looked quite like the crab I found on the beach. I learned a lot about that kind of crab.
Sometimes a fiddler crab puts the small claw across the big one. It looks like it is playing the fiddle(violin) when it does this, so some people call it the fiddler crab. Sometimes it waves(挥动) its big claw. It looks like it is saying hello. That's why other people call it the calling crab. Fiddler crabs' eyes are on long eye stalks(眼柄). They can put up their eye stalks to look around. It makes them look taller.
These crabs are very small. There are lots of other bigger beach animals that want to eat them. They dig holes in the sand. The holes are their homes. They are safe inside them. Sometimes the sea water can bring food into their holes.
回答下面5个问题,每题答案不超过8个单词。
1. What was the difference of two claws of the crab the writer saw?
2. How did the writer find out the crab's name?
3. What's another name for the fiddler crab?
4. When do fiddler crabs look taller?
5. Where do fiddler crabs live?
One sunny afternoon, I went for a walk on the beach. There I saw a special crab(螃蟹). It had two claws(螯). One claw was much bigger and longer than the other. I had never seen such a crab before. So on my way home from the beach, I walked into the library.
Luckily, I found a book named Come with Me to the Edge of the Sea. It had many pictures of animals living near the sea. The pictures of male fiddler crabs (雄性招潮蟹) looked quite like the crab I found on the beach. I learned a lot about that kind of crab.
Sometimes a fiddler crab puts the small claw across the big one. It looks like it is playing the fiddle(violin) when it does this, so some people call it the fiddler crab. Sometimes it waves(挥动) its big claw. It looks like it is saying hello. That's why other people call it the calling crab. Fiddler crabs' eyes are on long eye stalks(眼柄). They can put up their eye stalks to look around. It makes them look taller.
These crabs are very small. There are lots of other bigger beach animals that want to eat them. They dig holes in the sand. The holes are their homes. They are safe inside them. Sometimes the sea water can bring food into their holes.
回答下面5个问题,每题答案不超过8个单词。
1. What was the difference of two claws of the crab the writer saw?
One was bigger and longer than the other.
2. How did the writer find out the crab's name?
By reading a book.
3. What's another name for the fiddler crab?
The calling crab.
4. When do fiddler crabs look taller?
When/After they put up their eye stalks.
5. Where do fiddler crabs live?
In the holes in the sand.
答案
[文章大意]本文是一篇记叙文。文章讲述了作者在海滩偶遇了一种特殊的螃蟹,通过阅读图书馆的书籍了解了雄性招潮蟹的特性与生存方式。
1. One was bigger and longer than the other.
2. By reading a book.
3. The calling crab.
4. When/After they put up their eye stalks.
5. In the holes in the sand.
1. One was bigger and longer than the other.
2. By reading a book.
3. The calling crab.
4. When/After they put up their eye stalks.
5. In the holes in the sand.
解析
【分析】
这是细节类阅读简答题，解题思路清晰：先逐个明确题干的提问方向，带着每个问题回到原文对应段落定位相关语句，再从定位句里提取核心信息，同时严格遵守题干要求的“每题答案不超过8个单词”的字数限制，剔除冗余修饰内容，就能得到准确答案。所有题目的对应信息都可以在原文直接找到对应位置，不需要额外推导。
【解析】
1. 定位原文第一段第四句"One claw was much bigger and longer than the other"，提取核心信息，删去冗余修饰词，得到符合字数要求的答案。
2. 结合原文末尾作者前往图书馆、第二段找到相关书籍了解螃蟹信息的内容，提炼核心行为得到答案。
3. 定位原文第三段"That's why other people call it the calling crab"，直接提取螃蟹的别名即可。
4. 定位原文第三段"They can put up their eye stalks to look around. It makes them look taller"，整合逻辑得到对应时间的答案。
5. 定位原文第四段"They dig holes in the sand. The holes are their homes"，直接提取居住地点的核心表述即可。
【答案】
1. One was bigger and longer than the other.
2. By reading a book.
3. The calling crab.
4. When they put up their eye stalks.
5. In the holes in the sand.
【知识点】
阅读理解细节定位；简答信息提炼；文本信息匹配
【点评】
本题属于基础阅读简答题，所有答案都可以从原文直接找到对应依据，没有设置干扰项，只需要学生准确定位语句、提炼核心信息，同时注意控制答案词数不超过8个，就可以顺利得分，适合锻炼学生的基础阅读信息抓取能力。
【难度系数】
0.8
这是细节类阅读简答题，解题思路清晰：先逐个明确题干的提问方向，带着每个问题回到原文对应段落定位相关语句，再从定位句里提取核心信息，同时严格遵守题干要求的“每题答案不超过8个单词”的字数限制，剔除冗余修饰内容，就能得到准确答案。所有题目的对应信息都可以在原文直接找到对应位置，不需要额外推导。
【解析】
1. 定位原文第一段第四句"One claw was much bigger and longer than the other"，提取核心信息，删去冗余修饰词，得到符合字数要求的答案。
2. 结合原文末尾作者前往图书馆、第二段找到相关书籍了解螃蟹信息的内容，提炼核心行为得到答案。
3. 定位原文第三段"That's why other people call it the calling crab"，直接提取螃蟹的别名即可。
4. 定位原文第三段"They can put up their eye stalks to look around. It makes them look taller"，整合逻辑得到对应时间的答案。
5. 定位原文第四段"They dig holes in the sand. The holes are their homes"，直接提取居住地点的核心表述即可。
【答案】
1. One was bigger and longer than the other.
2. By reading a book.
3. The calling crab.
4. When they put up their eye stalks.
5. In the holes in the sand.
【知识点】
阅读理解细节定位；简答信息提炼；文本信息匹配
【点评】
本题属于基础阅读简答题，所有答案都可以从原文直接找到对应依据，没有设置干扰项，只需要学生准确定位语句、提炼核心信息，同时注意控制答案词数不超过8个，就可以顺利得分，适合锻炼学生的基础阅读信息抓取能力。
【难度系数】
0.8
