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B
Do you like blueberries? Next time you eat them, take a close look and ask yourself: Are blueberries really blue?
In fact, most parts of blueberries aren't blue. Peel(剥) one and you'll find white inside. If you rub(擦) the white on paper, it will leave a red-purple colour. Rub the outside slowly, and you'll find the blue disappear. It turns into almost black. So why do they look blue?
Well, there are two ways to create colours. One is through pigments(色素). Pigments show the colour of light when they don't absorb it. For example, plant leaves are green because chlorophyll(叶绿素) doesn't catch green light. In fact, there aren't any "true blue" pigments in the plant world.
The second way to make colour is through "structural colour(结构色)". This happens when the surface makes some colours of light look different. Like the rainbow on a CD from small spaces, blueberries have a thin space (just 0.004 cm wide) on their surface. This space makes them look blue. The colour makes birds eat them and take their seeds far and wide.
Now your basket of blueberries suddenly looks a lot more interesting. The fruit is beautiful, but its beauty is just "surface deep"!
(
A. By asking questions.
B. By telling a story.
C. By listing numbers.
D. By giving an example.
(
absorb [əb'zɔːb] v.
A. to interest someone so much
B. to become part of something larger
C. to catch light, heat from something around
D. to read or hear much information and understand it
(
A. Rubbing the white.
B. The surface space.
C. True blue pigments.
D. The colour of light.
(
A. To show how to grow blueberries.
B. To tell different colours of blueberries.
C. To advise people to eat blueberries.
D. To explain why blueberries look blue.
Do you like blueberries? Next time you eat them, take a close look and ask yourself: Are blueberries really blue?
In fact, most parts of blueberries aren't blue. Peel(剥) one and you'll find white inside. If you rub(擦) the white on paper, it will leave a red-purple colour. Rub the outside slowly, and you'll find the blue disappear. It turns into almost black. So why do they look blue?
Well, there are two ways to create colours. One is through pigments(色素). Pigments show the colour of light when they don't absorb it. For example, plant leaves are green because chlorophyll(叶绿素) doesn't catch green light. In fact, there aren't any "true blue" pigments in the plant world.
The second way to make colour is through "structural colour(结构色)". This happens when the surface makes some colours of light look different. Like the rainbow on a CD from small spaces, blueberries have a thin space (just 0.004 cm wide) on their surface. This space makes them look blue. The colour makes birds eat them and take their seeds far and wide.
Now your basket of blueberries suddenly looks a lot more interesting. The fruit is beautiful, but its beauty is just "surface deep"!
(
A
)19. How does the writer lead into the topic?A. By asking questions.
B. By telling a story.
C. By listing numbers.
D. By giving an example.
(
C
)20. Which is the meaning of the underlined word "absorb"?absorb [əb'zɔːb] v.
A. to interest someone so much
B. to become part of something larger
C. to catch light, heat from something around
D. to read or hear much information and understand it
(
B
)21. What makes blueberries look blue according to the passage?A. Rubbing the white.
B. The surface space.
C. True blue pigments.
D. The colour of light.
(
D
)22. What is the main purpose of the text?A. To show how to grow blueberries.
B. To tell different colours of blueberries.
C. To advise people to eat blueberries.
D. To explain why blueberries look blue.
答案
19.A 20.C 21.B 22.D
解析
【分析】
19题：首先定位文章开头，作者通过连续提出关于蓝莓的问题引出核心话题，据此判断引入方式；
20题：结合上下文语境，后文举例说明叶绿素不“catch”绿光，与absorb所在句子逻辑呼应，推测词义；
21题：定位文章第四段，找到关于蓝莓呈蓝色原因的关键语句，匹配选项；
22题：梳理全文内容，明确文章围绕“蓝莓为何看起来是蓝色”展开，确定主旨。
【解析】
19题：文章开篇使用“Do you like blueberries? ... Are blueberries really blue?”等疑问句，以提问的方式引入话题，故选A。
20题：由后文“plant leaves are green because chlorophyll doesn't catch green light”可知，色素不吸收光时会呈现对应颜色，故absorb意为“吸收（光、热等）”，对应选项C。
21题：根据第四段“blueberries have a thin space (just 0.004 cm wide) on their surface. This space makes them look blue.”可知，蓝莓表面的微小空间使其呈现蓝色，故选B。
22题：全文从色素和结构色两方面解释蓝莓看起来是蓝色的原因，核心目的是说明该问题，故选D。
【答案】
19.A 20.C 21.B 22.D
【知识点】
英语阅读理解、词义猜测、主旨大意
【点评】
本文为科普类英语阅读材料，考查学生对文章细节、词义及主旨的理解能力，解题需精准定位原文关键信息，难度适中，是初中英语常见题型。
【难度系数】
0.7
19题：首先定位文章开头，作者通过连续提出关于蓝莓的问题引出核心话题，据此判断引入方式；
20题：结合上下文语境，后文举例说明叶绿素不“catch”绿光，与absorb所在句子逻辑呼应，推测词义；
21题：定位文章第四段，找到关于蓝莓呈蓝色原因的关键语句，匹配选项；
22题：梳理全文内容，明确文章围绕“蓝莓为何看起来是蓝色”展开，确定主旨。
【解析】
19题：文章开篇使用“Do you like blueberries? ... Are blueberries really blue?”等疑问句，以提问的方式引入话题，故选A。
20题：由后文“plant leaves are green because chlorophyll doesn't catch green light”可知，色素不吸收光时会呈现对应颜色，故absorb意为“吸收（光、热等）”，对应选项C。
21题：根据第四段“blueberries have a thin space (just 0.004 cm wide) on their surface. This space makes them look blue.”可知，蓝莓表面的微小空间使其呈现蓝色，故选B。
22题：全文从色素和结构色两方面解释蓝莓看起来是蓝色的原因，核心目的是说明该问题，故选D。
【答案】
19.A 20.C 21.B 22.D
【知识点】
英语阅读理解、词义猜测、主旨大意
【点评】
本文为科普类英语阅读材料，考查学生对文章细节、词义及主旨的理解能力，解题需精准定位原文关键信息，难度适中，是初中英语常见题型。
【难度系数】
0.7
