题型:阅读选择 题类: 难易度:困难
广东省深圳市南山育才教育集团2024-2025学年九年级上学期期中试卷
Blue is a very common color in our lives-the sky, the sea and even face masks are often blue. But this color is not frequently(经常) seen in plants. Why is that?
A. Because blue plants would blend in(融合) with the sky and sea.
B. Because animals prefer to eat blue plants.
C. Because the material that gives plants a blue color is rare(稀有的)
D. Because blue isn't a beneficial(有助的)color for plant growth.
The correct answer is D
There is no true blue pigment(色素)in nature. When light hits an object(物体), the object absorbs(吸收)some colors and reflects(反射)others. For example, plants look green because they reflect green light and absorb other colors. Blue light offers more energy than other colors. However, if a plant has blue leaves, according to scientists from the University at Adelaide in Australia, it must absorb(吸收) very small amounts of energy while reflecting high-energy blue light. This is not a good strategy(策略) for growth.
Less than 10 percent of plants are blue. Plants make blue flowers by mixing pigments. For example, anthocyanins(花青素)can turn into a blue-likes color with a certain amount of acidity(酸度). Plants may make use of this unique color to attract pollinators(传粉者), such as bees.
old part for May also big more because celebrate new still they |
Festivals have always been an important part of life and culture. In the modern age, {#blank#}1{#/blank#} festivals have appeared. Some of the new festivals come from different {#blank#}2{#/blank#} of the world. Some appeared just because of the interesting meanings of the dates.
Now people around the world {#blank#}3{#/blank#} International Women's Day, International Museum Day and International Nurses' Day. These festivals didn't start in China, but we celebrate them in a Chinese way. {#blank#}4{#/blank#} example, many Chinese call International Women' s Day "Girls' Day" or "Queens' Day". On this day, {#blank#}5{#/blank#} have interesting activities such as dressing up in Hanfu.
Other new festivals include 520 Day, Eating Day (May 17th), and Double 11 Day. 520 is on{#blank#}6{#/blank#} 20th. In Chinese, it sounds like "I love you" and 517 sounds like "I want to eat". Double 11 Day is 42. {#blank#}7{#/blank#} known as Singles' Day, because the date November 11th or "11.11" is about the number "1". So Double 11 Day is about "single". And it is now one of the {#blank#}8{#/blank#} shopping days in the world.
For many young people, new festivals seem to be much {#blank#}9{#/blank#} interesting than the old ones. But it doesn't matter whether they are old or new {#blank#}10{#/blank#} festivals always offer a great chance for us to enjoy life with our loved ones.
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