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2019-2020学年广州市邝维煜纪念中学高三英语期中考试试题及答案解析-
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2019-2020 学年广州市邝维煜纪念中学高三英语期中考试试题及答案 解析
第一部分 阅读（共两节，满分40分）
第一节（共15小题；每小题2分，满分30分）
阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项
A
If you are sending a text message watching TV or listening to the radio, you may stop and give this your full attention. Multitasking shrinks (使.....萎缩the brain? research suggests.
A study found that men and womenwho frequently used several types of technology at the same time had less grey matter in a key part of the brain. University of Sussex researchers said, " Using mobile phones, laptops and other media devicessimultaneouslycould be changing the structure of our brains."
Worryingly, the part of the brain that shrinks is involved in processing emotion. The finding follows research which has linked multitasking with a shortened attention span, depression , anxiety and lower grades at school.
The researchers began by asking 75 healthy men and women how often they divided their attention between different types of technology. This could mean sending a text message while listening to music and checking e-mail, or speaking on the phone while watching TV and surfing the Internet. The volunteers were then given brain scans which showed they had less grey matter in a region called the anterior cingu-late cortex (ACC(前扣带皮层.Scientists have proved that brain structure can be changed on exposure to fresh environments and experience.
Other studies have shown that training—such as learning to play magic tricks or taxi drivers' learning the map of London―can increase grey matter densities (密度in certain parts.
Experts have also warned of the harmful impact technology can have on our memory and attention span. The University of California team conducted a survey of more than 18,000 people aged between 18 and 99，and found 20%had problems with memory. Researchers were shocked greatly by the 14 % of 18 to 39-year-old people who also worried about their memories.
Multitasking may shorten attention span, making it harder to focus and form memories, the researchers said, adding that youngsters may be particularly affected by stress.
1. The underlined word " simultaneously" in Paragraph 2 means "________，" A. on one's own B. at no time C. at the same time D. by accident
2. All of the following are possible effects of multitasking EXCEPT________ .
A. saving time
B. a shortened attention span C. lower grades at school D. depression and anxiety
3. Which ofthe following can be the best title of this passage? A. Media multitasking is becoming more popular B. Multitasking shrinks the brain
C. Multitasking may shorten attention span D. People are worried about their memories.
B
Scientists have discovered a new behaviour among bumblebees that tricks plants into flowering early. When lack of pollen, bumblebees will bite little by little on the leaves of flower-less plants. The damage seems to fool the plant into flowering, sometimes up to 30 days earlier than normal.
With their hairy appearance and special sounds, bumblebees are hard to miss in gardens all over the world. Their hairy bodies make them excellent pollinators for crops like tomatoes and blueberries. They are among the first bees to appear each year and work a long season.
But despite their key role, bumblebees, like many other pollinators have seen their numbers decline suddenly in recent decades. One recent study pointed to climate change, reporting that an increasing number of hot days in Europe andNorth Americawas raising local bumblebees extinction rates.
But researchers have now made a discovery about bumblebees that could have something to do with their long term survival. Scientists inSwitzerlandfound that when the bumblebees were out of pollen, they started to bite on the leaves of plants that hadn't yet flowered. They used their mouths to cut clearly-shaped holes in the leaves. But the creatures didn't eat the material or use it in their nests.
The damaged plants responded by flowering earlier than normal- -in some cases up to 30 days ahead of schedule. Researchers also found that the bee damaged plants flowered 30 days earlier than undamaged plants and 25 days earlier than ones damaged by the scientists.
“I think everything that we've found is consistent with the idea that the bumblebees are damaging the plants and that that's an adaptation that brings flowers earlier and that benefits the bees,” said Dr Mark Mescher, one of the authors from ETHZurich.
4. How do bumblebees fool plants into flowering earlier?
A. By making use of the hot weather. B. By putting the false flowers on the leaves.
C. By attacking the leaves of flowerless plants. D. By taking away the pollen from the other flowers. 5. What's bumblebees’ key role?
A.Making plants flower early. B. Spreading pollen to flowers and plants.
C. Sending information about weather change. D. Finding out whether the plant has flowers. 6. What has happened to bumblebees in the past the years?
A. They are becoming homesick. B. They are not as friendly as before. C. There is a sharp decrease in number. D. They have been busy year by year.