题型:阅读选择 题类:真题 难易度:困难
江苏省连云港市2020年中考英语试卷
We always think that it's OK for us to leave our plants home during our vacation as plants won't scream like pets, right?
A recent study done by a group of scientists at the Tel Aviv University has discovered that some plants will scream when they are under stress.
The research was carried out on tomato plants and tobacco plants by cutting their stems (茎) and depriving (剥夺) them of water. A microphone was placed 10cm away from them. When their stems were cut, the plants started "screaming" between 20 and 100 kilohertz, and the scientists guess that this scream is probably meant to warn other plants nearby.
When the tomato plants' stems were cut, 25 ultrasonic (超声的) pain sounds were recorded in an hour, and at the same time, 15 ultrasonic pain sounds were recorded from the tobacco plants. When they were deprived of water, the tomato plants recorded even more pain sounds with 35 pain sounds in an hour while the tobacco plants recorded about 11 pain sounds.
The plants also acted differently to different kinds of stresses. For example, the tobacco plants gave out a stronger "scream" when they were deprived of water than when their stems were cut. But plants that were in no immediate (立刻的) danger gave out less than one ultrasonic sound per hour.
The group of scientists said that plants are not as quiet as we had always thought, but in fact their voices are so high-pitched that we just can't hear them.
Last year, another study has found out that plants feel pain when they are touched or hurt and they will give off a terrible smell.
A. single B. speed C. richest D. simple E. on average F. be called |
The Yarlung Tsangpo Grand Canyon is more than 500 kilometers long and 2, 268meters deep{#blank#}1{#/blank#}, with the deepest point reaching 6, 009 meters and the river running at a top{#blank#}2{#/blank#} of sixteen meters per second. Hence some people call it a "waterfall on the riverbed". This world's deepest and largest canyon in southeast Tibet also accommodates the{#blank#}3{#/blank#} mountainous biodiversity () on the globe. Here you can see many rare animals and plants and experience the change of the four seasons within a {#blank#}4{#/blank#} day. It could{#blank#}5{#/blank#} "the last wonderland on Earth. "
Christmas for Americans is like the Spring Festival for Chinese people. It is a time when families get together and everyone is happy. {#blank#}1{#/blank#} Before Christmas, everyone goes shopping to buy the gift for a family member, or a friend. Then they put the gifts under the Christmas tree. {#blank#}2{#/blank#}
In the weeks before Christmas, the shops are full of wonderful things that children want.
{#blank#}3{#/blank#} Pets look cute, and some pets are not too expensive to buy — it is easy to buy one quickly. But before you buy a pet, you should ask yourself some important questions, such as" How long do I love this pet?"" Do I have enough time to keep it?"" Can the pet be happy in my family?"{#blank#}4{#/blank#} Because the family thinks the pets are not interesting any more, or they don't have enough time or money for the pets. So in the UK at Christmas time, you can see many signs(标牌) in pet shops:{#blank#}5{#/blank#} Think before you buy one!
A. It is also a time for giving gifts. B. A pet is for life, not for Christmas. C. Most people have to wait until Christmas morning before they can open the gifts. D. Children often ask their parents for a pet, so pet shops are very popular. E. It's sad but true that not long after Christmas, people don't want to keep them. |
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