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Oceans cover about $71\%$ of the Earth, but we still don't know much about them, especially(尤其) the deep sea. Why did we know so little about the deep sea? Because it was really difficult to get there and we need special machines to help us. In 1620, the first submarine(潜艇) was made. It could go underwater, but it couldn't go deeper than five metres. For many years, scientists thought there was no life deeper than 550 metres in the sea, so they didn't try to explore the deep sea much. But in 1867, some sea plants and animals were found at 940 metres deep under the sea. Just several years later, more than 4,000 other new kinds were found from the ocean floor.
With the help of science and technology, new machines like satellites(卫星) now help explore the deep sea. But deep-sea exploration is still so difficult. Because in the deep sea, it is freezing cold and completely dark.
Understanding and exploring the deep sea can help control (控制) the Earth's temperature(温度) and produce clean gases in the air. They can also provide information about climate change. So scientists are still working hard on it.
(
A. Because there was no interest in ocean life.
B. Because it was too dark and cold in the deep sea.
C. Because the first submarine could only go five metres deep.
D. Because scientists believed there was no life below 550 metres.
(
A. Maps of the ocean floor.
B. Deep sea animals and plants.
C. Modern science and technology.
D. Darkness and low temperature.
(
A. It can help us create more submarines.
B. It can help us find gold under the sea.
C. It can help make the ocean water warmer.
D. It can help control the Earth's temperature and study climate change.
Oceans cover about $71\%$ of the Earth, but we still don't know much about them, especially(尤其) the deep sea. Why did we know so little about the deep sea? Because it was really difficult to get there and we need special machines to help us. In 1620, the first submarine(潜艇) was made. It could go underwater, but it couldn't go deeper than five metres. For many years, scientists thought there was no life deeper than 550 metres in the sea, so they didn't try to explore the deep sea much. But in 1867, some sea plants and animals were found at 940 metres deep under the sea. Just several years later, more than 4,000 other new kinds were found from the ocean floor.
With the help of science and technology, new machines like satellites(卫星) now help explore the deep sea. But deep-sea exploration is still so difficult. Because in the deep sea, it is freezing cold and completely dark.
Understanding and exploring the deep sea can help control (控制) the Earth's temperature(温度) and produce clean gases in the air. They can also provide information about climate change. So scientists are still working hard on it.
(
D
)5. Why didn't people explore the deep sea much before 1867?A. Because there was no interest in ocean life.
B. Because it was too dark and cold in the deep sea.
C. Because the first submarine could only go five metres deep.
D. Because scientists believed there was no life below 550 metres.
(
C
)6. According to the text, what helps scientists explore the deep sea?A. Maps of the ocean floor.
B. Deep sea animals and plants.
C. Modern science and technology.
D. Darkness and low temperature.
(
D
)7. How can exploring the deep sea help us?A. It can help us create more submarines.
B. It can help us find gold under the sea.
C. It can help make the ocean water warmer.
D. It can help control the Earth's temperature and study climate change.
答案
5. D 6. C 7. D
解析
【分析】本题为英语阅读理解细节题，需根据题干关键词定位原文对应内容，逐一匹配选项得出答案。分别针对第5题（关键词“before 1867”）、第6题（关键词“helps explore the deep sea”）、第7题（关键词“help us”），定位原文对应段落提取关键信息。
【解析】
5. 定位原文第一段：“For many years, scientists thought there was no life deeper than 550 metres in the sea, so they didn't try to explore the deep sea much.”，可知1867年前人们未大量探索深海的原因是科学家认为550米以下无生命，对应选项D。
6. 定位原文第二段：“With the help of science and technology, new machines like satellites now help explore the deep sea.”，可知现代科技帮助科学家探索深海，对应选项C。
7. 定位原文第三段：“Understanding and exploring the deep sea can help control the Earth's temperature... They can also provide information about climate change.”，可知探索深海有助于控制地球温度和研究气候变化，对应选项D。
【答案】5.D 6.C 7.D
【知识点】英语阅读理解，细节理解题
【点评】本题围绕深海探索主题，考查学生快速提取原文细节信息的能力，题型为常见的细节理解题，难度适中，仔细阅读原文即可正确作答。
【难度系数】0.6
【解析】
5. 定位原文第一段：“For many years, scientists thought there was no life deeper than 550 metres in the sea, so they didn't try to explore the deep sea much.”，可知1867年前人们未大量探索深海的原因是科学家认为550米以下无生命，对应选项D。
6. 定位原文第二段：“With the help of science and technology, new machines like satellites now help explore the deep sea.”，可知现代科技帮助科学家探索深海，对应选项C。
7. 定位原文第三段：“Understanding and exploring the deep sea can help control the Earth's temperature... They can also provide information about climate change.”，可知探索深海有助于控制地球温度和研究气候变化，对应选项D。
【答案】5.D 6.C 7.D
【知识点】英语阅读理解，细节理解题
【点评】本题围绕深海探索主题，考查学生快速提取原文细节信息的能力，题型为常见的细节理解题，难度适中，仔细阅读原文即可正确作答。
【难度系数】0.6
