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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(颜料). 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 a question.
B. By telling a story.
C. By listing numbers.
D. By giving an example.
(
absorb [əbˈzɔːb] 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.
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(颜料). 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
)25. How does the writer lead into the topic?A. By asking a question.
B. By telling a story.
C. By listing numbers.
D. By giving an example.
(
C
)26. Which is the meaning of the underlined word "absorb"?absorb [əbˈzɔːb] 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
)27. 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
)28. 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
25.A 26.C 27.B 28.D
解析
【分析】
本题为英语阅读理解题，需先通读文章理解内容，再针对每个问题定位原文信息，结合题型特点（细节理解、词义猜测、主旨大意）逐一分析选项得出答案。
【解析】
25题：作者以“Do you like blueberries?”“Are blueberries really blue?”等问句引入话题，属于提问方式，对应选项A。
26题：根据上下文，后文举例“chlorophyll doesn't catch green light”说明叶绿素不吸收绿光，故absorb与catch（吸收）含义相近，选项C符合。
27题：原文第四段明确指出蓝莓表面的薄层空间（0.004cm宽）使其呈现蓝色，对应选项B。
28题：文章围绕“蓝莓为什么看起来是蓝色”展开，解释了颜色形成的两种方式及蓝莓蓝色的成因，主旨是解释蓝莓显蓝的原因，对应选项D。
【答案】
25.A 26.C 27.B 28.D
【知识点】
英语阅读理解、词义猜测、细节理解、主旨大意
【点评】
本文为科普类短文，题目考查基础阅读能力，需结合原文细节、上下文逻辑及主旨归纳解题，难度适中。
【难度系数】
0.6
本题为英语阅读理解题，需先通读文章理解内容，再针对每个问题定位原文信息，结合题型特点（细节理解、词义猜测、主旨大意）逐一分析选项得出答案。
【解析】
25题：作者以“Do you like blueberries?”“Are blueberries really blue?”等问句引入话题，属于提问方式，对应选项A。
26题：根据上下文，后文举例“chlorophyll doesn't catch green light”说明叶绿素不吸收绿光，故absorb与catch（吸收）含义相近，选项C符合。
27题：原文第四段明确指出蓝莓表面的薄层空间（0.004cm宽）使其呈现蓝色，对应选项B。
28题：文章围绕“蓝莓为什么看起来是蓝色”展开，解释了颜色形成的两种方式及蓝莓蓝色的成因，主旨是解释蓝莓显蓝的原因，对应选项D。
【答案】
25.A 26.C 27.B 28.D
【知识点】
英语阅读理解、词义猜测、细节理解、主旨大意
【点评】
本文为科普类短文，题目考查基础阅读能力，需结合原文细节、上下文逻辑及主旨归纳解题，难度适中。
【难度系数】
0.6
