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Plants can help with climate(气候) change by taking in carbon dioxide(二氧化碳). But if it gets too hot, they might do the opposite(反面), a new study said.
Plants are very important. They take in air through tiny(极小的) holes in their leaves. With sunlight, they turn this air into food and give out oxygen(氧气). People thought plants lost most of their water through these tiny holes. When it is hot, the holes close so plants don't lose too much water.
But a new study found that when it is hot, plants lose more water through a layer(层) on their leaves. This layer cannot close. So, in very hot weather, plants keep losing water but can't take in air to make food. This makes it hard for them to clean the air.
If it gets too hot, plants might even release carbon dioxide back into the air. This could make climate change worse. Scientists said this could happen when it is about 30℃.
读后探究
I. 根据文章内容完成思维导图
II. 根据文章内容选择最佳选项
(
A. By losing water.
B. By taking in oxygen.
C. By taking in carbon dioxide.
D. By giving out carbon dioxide.
(
A. They don't lose water in hot weather.
B. Only through the layer on their leaves.
C. Mainly through the tiny holes in their leaves.
D. Mainly through a layer on their leaves that can't close.
(
A. Plants would grow faster.
B. Plants would clean the air better.
C. Plants would take in more oxygen.
D. Plants would release carbon dioxide back into the air.
III. 反思与实践
9. What insights(感悟) do you have after reading this text?
Plants are very important. They take in air through tiny(极小的) holes in their leaves. With sunlight, they turn this air into food and give out oxygen(氧气). People thought plants lost most of their water through these tiny holes. When it is hot, the holes close so plants don't lose too much water.
But a new study found that when it is hot, plants lose more water through a layer(层) on their leaves. This layer cannot close. So, in very hot weather, plants keep losing water but can't take in air to make food. This makes it hard for them to clean the air.
If it gets too hot, plants might even release carbon dioxide back into the air. This could make climate change worse. Scientists said this could happen when it is about 30℃.
读后探究
I. 根据文章内容完成思维导图
II. 根据文章内容选择最佳选项
(
C
)6. How do plants usually help with climate change?A. By losing water.
B. By taking in oxygen.
C. By taking in carbon dioxide.
D. By giving out carbon dioxide.
(
D
)7. According to the new study, how do plants lose water in hot weather?A. They don't lose water in hot weather.
B. Only through the layer on their leaves.
C. Mainly through the tiny holes in their leaves.
D. Mainly through a layer on their leaves that can't close.
(
D
)8. What would happen when the temperature is about 30℃?A. Plants would grow faster.
B. Plants would clean the air better.
C. Plants would take in more oxygen.
D. Plants would release carbon dioxide back into the air.
III. 反思与实践
9. What insights(感悟) do you have after reading this text?
We should take action to stop global warming./We should plant more trees.(答案不唯一,言之有理即可)
答案：
I .1.in 2.food 3.tiny 4.clean 5.worse
Ⅱ.6-8 CDD
Ⅲ.9.We should take action to stop global warming./We should plant more trees.(答案不唯一,言之有理即可)
Ⅱ.6-8 CDD
Ⅲ.9.We should take action to stop global warming./We should plant more trees.(答案不唯一,言之有理即可)
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