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D
根据短文内容，从文后选项中选出能填入文中空白处的最佳选项。其中有两项多余。
The Great Barrier Reef is one of the most incredible natural wonders of the world. Located off the northeast coast of Australia, it is the largest coral reef system on the planet. 27 It is so large that it can even be seen from space!
This amazing ecosystem is made up of over 2,900 individual reefs and 900 islands. The reef is home to a breathtaking variety of marine life. 28 These include about 1,500 species of fish, 400 types of coral, and thousands of other species like dolphins, sharks, and sea turtles.
The coral itself is a living organism(生物). Tiny animals called polyps(珊瑚虫) build the coral structures. 29 This relationship is very sensitive to changes in the environment.
Unfortunately, the Great Barrier Reef is facing serious threats. Climate change is causing ocean temperatures to rise. 30 This causes the coral to expel(排出) the algae and turn white, a phenomenon(现象) known as coral bleaching(白化). Bleached coral is not dead, but it is under great stress and can die if the water does not cool down.
31 Scientists are working hard to find solutions, and there are many things we can do to help, such as reducing plastic pollution and supporting clean energy to fight climate change. Protecting this beautiful underwater world is a responsibility for all of us.
A. For example, you can find colourful clownfish swimming among the sea anemones(海葵).
B. It stretches for about 2,300 kilometres, which is about the same length as the west coast of the United States.
C. Pollution from the land and overfishing are also damaging the reef's health.
D. This process has been happening for millions of years.
E. They have a symbiotic relationship with colourful algae (藻类) that live in their tissues.
F. Many people believe that the reef was discovered only recently.
G. When the water gets too warm, the algae become stressed and leave the coral.
27.
28.
29.
30.
31.
根据短文内容，从文后选项中选出能填入文中空白处的最佳选项。其中有两项多余。
The Great Barrier Reef is one of the most incredible natural wonders of the world. Located off the northeast coast of Australia, it is the largest coral reef system on the planet. 27 It is so large that it can even be seen from space!
This amazing ecosystem is made up of over 2,900 individual reefs and 900 islands. The reef is home to a breathtaking variety of marine life. 28 These include about 1,500 species of fish, 400 types of coral, and thousands of other species like dolphins, sharks, and sea turtles.
The coral itself is a living organism(生物). Tiny animals called polyps(珊瑚虫) build the coral structures. 29 This relationship is very sensitive to changes in the environment.
Unfortunately, the Great Barrier Reef is facing serious threats. Climate change is causing ocean temperatures to rise. 30 This causes the coral to expel(排出) the algae and turn white, a phenomenon(现象) known as coral bleaching(白化). Bleached coral is not dead, but it is under great stress and can die if the water does not cool down.
31 Scientists are working hard to find solutions, and there are many things we can do to help, such as reducing plastic pollution and supporting clean energy to fight climate change. Protecting this beautiful underwater world is a responsibility for all of us.
A. For example, you can find colourful clownfish swimming among the sea anemones(海葵).
B. It stretches for about 2,300 kilometres, which is about the same length as the west coast of the United States.
C. Pollution from the land and overfishing are also damaging the reef's health.
D. This process has been happening for millions of years.
E. They have a symbiotic relationship with colourful algae (藻类) that live in their tissues.
F. Many people believe that the reef was discovered only recently.
G. When the water gets too warm, the algae become stressed and leave the coral.
27.
B
28.
A
29.
E
30.
G
31.
C
答案
27.B 28.A 29.E 30.G 31.C
解析
【分析】
这是一篇科普类的七选五阅读题，解题时首先通读全文，明确文章围绕大堡礁的基本概况、生态构成、珊瑚的生存特性、面临的生存威胁及保护方向展开。接下来逐空定位前后文的逻辑关联：
1. 第27空前后都在描述大堡礁的规模大小，需要填入承接“最大珊瑚礁系统”、引出“太空可见”的描述尺寸的句子；
2. 第28空前文提到大堡礁有极丰富的海洋生物，后文开始列举各类海洋物种，需要填入衔接“生物多样”、引出具体物种举例的内容；
3. 第29空后文提到“这种关系对环境变化很敏感”，说明空格处必须要先引出某种生物间的特定关系；
4. 第30空前文提到海水升温，后文提到珊瑚排出藻类发生白化，需要填入衔接升温、藻类离开珊瑚的因果过渡句；
5. 第31空前文已经提到气候变化带来的威胁，后文开始讲应对措施，需要填入补充其他威胁的过渡内容，最后排除两个多余无关选项即可得到答案。
【解析】
27. 前文点明大堡礁是全球最大的珊瑚礁系统，后文说明它大到可从太空观测，B选项“它绵延约2300公里，长度几乎和美国西海岸相当”是对大堡礁规模的具体描述，完美承接前后文，故选B。
28. 前文指出大堡礁有种类繁多的海洋生物，后文列举了鱼类、珊瑚、海豚等物种，A选项“例如，你能看到色彩鲜艳的小丑鱼在海葵间游动”是对海洋生物多样性的具体举例，符合上下文逻辑，故选A。
29. 后文提到“这种关系对环境变化非常敏感”，E选项“它们和生活在其组织里的彩色藻类存在共生关系”明确引出了珊瑚虫和藻类的共生关系，后文的“this relationship”正好指代该内容，衔接通顺，故选E。
30. 前文说明气候变化导致海水温度上升，后文提到珊瑚排出藻类发生白化，G选项“当水温过高时，藻类会受到胁迫并离开珊瑚”正好衔接水温升高和珊瑚排出藻类的过程，逻辑连贯，故选G。
31. 前文已经介绍了气候变暖带来的白化威胁，后文引出人们需要采取行动保护大堡礁，C选项“陆地污染和过度捕捞也在损害珊瑚礁的健康”补充了大堡礁面临的其他威胁，符合语境逻辑，故选C。
【答案】
27.B 28.A 29.E 30.G 31.C
【知识点】
阅读理解七选五，语篇逻辑衔接，细节信息匹配
【点评】
本题属于科普类阅读七选五题型，整体脉络清晰，考点集中在指代关系、举例逻辑、因果逻辑的判断上，干扰项和文章主题关联度低，学生只要抓住前后句的关键词对应关系就能顺利选出正确答案，同时还能了解到大堡礁的相关科普知识。
【难度系数】
0.7
这是一篇科普类的七选五阅读题，解题时首先通读全文，明确文章围绕大堡礁的基本概况、生态构成、珊瑚的生存特性、面临的生存威胁及保护方向展开。接下来逐空定位前后文的逻辑关联：
1. 第27空前后都在描述大堡礁的规模大小，需要填入承接“最大珊瑚礁系统”、引出“太空可见”的描述尺寸的句子；
2. 第28空前文提到大堡礁有极丰富的海洋生物，后文开始列举各类海洋物种，需要填入衔接“生物多样”、引出具体物种举例的内容；
3. 第29空后文提到“这种关系对环境变化很敏感”，说明空格处必须要先引出某种生物间的特定关系；
4. 第30空前文提到海水升温，后文提到珊瑚排出藻类发生白化，需要填入衔接升温、藻类离开珊瑚的因果过渡句；
5. 第31空前文已经提到气候变化带来的威胁，后文开始讲应对措施，需要填入补充其他威胁的过渡内容，最后排除两个多余无关选项即可得到答案。
【解析】
27. 前文点明大堡礁是全球最大的珊瑚礁系统，后文说明它大到可从太空观测，B选项“它绵延约2300公里，长度几乎和美国西海岸相当”是对大堡礁规模的具体描述，完美承接前后文，故选B。
28. 前文指出大堡礁有种类繁多的海洋生物，后文列举了鱼类、珊瑚、海豚等物种，A选项“例如，你能看到色彩鲜艳的小丑鱼在海葵间游动”是对海洋生物多样性的具体举例，符合上下文逻辑，故选A。
29. 后文提到“这种关系对环境变化非常敏感”，E选项“它们和生活在其组织里的彩色藻类存在共生关系”明确引出了珊瑚虫和藻类的共生关系，后文的“this relationship”正好指代该内容，衔接通顺，故选E。
30. 前文说明气候变化导致海水温度上升，后文提到珊瑚排出藻类发生白化，G选项“当水温过高时，藻类会受到胁迫并离开珊瑚”正好衔接水温升高和珊瑚排出藻类的过程，逻辑连贯，故选G。
31. 前文已经介绍了气候变暖带来的白化威胁，后文引出人们需要采取行动保护大堡礁，C选项“陆地污染和过度捕捞也在损害珊瑚礁的健康”补充了大堡礁面临的其他威胁，符合语境逻辑，故选C。
【答案】
27.B 28.A 29.E 30.G 31.C
【知识点】
阅读理解七选五，语篇逻辑衔接，细节信息匹配
【点评】
本题属于科普类阅读七选五题型，整体脉络清晰，考点集中在指代关系、举例逻辑、因果逻辑的判断上，干扰项和文章主题关联度低，学生只要抓住前后句的关键词对应关系就能顺利选出正确答案，同时还能了解到大堡礁的相关科普知识。
【难度系数】
0.7
