题型：任务型阅读 题类：模拟题 难易度：普通
四川省棠湖中学2019届高三英语二诊模拟考试试卷
Every animal sleeps, but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month.
One idea is that sleep helps us strengthen new memories. We know that, while awake, fresh memories are recorded by reinforcing (加强) connections between brain cells, but the memory processes that take place while we sleep have been unclear.
Support is growing for a theory that sleep evolved so that connections between neurons (神经元) in the brain can be weakened overnight, making room for fresh memories to form the next day.
Now we have the most direct evidence yet that he is right. The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep, showing that the connections between neurons weaken while sleeping.
If Tononi's theory is right, it would explain why, when we miss a night's, we find it harder the next day to concentrate and learn new information — our brains may have smaller room for new experiences.
Their research also suggests how we may build lasting memories over time even though the synapses become thinner. The team discovered that some synapses seem to be protected and stayed the same size. “You keep what matters,” Tononi says.
A. We should also try to sleep well the night before.
B. It's as if the brain is preserving its most important memories.
C. That's why students do better in tests if they get a chance to sleep after learning.
D. Similarly, when people go for a few days without sleeping, they get sick.
E. The processes take place to stop our brains becoming loaded with memories.
F. Tononi's team measured the size of these connections, or synapses, in the brains of 12 mice.
G. “Sleep is the price we pay for learning,” says Giulio Tononi, who developed the idea.
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A. Robots will have replaced people in factories. B. Scientists have already produced clones of animals. C. Medical technology will have controlled many diseases. D. Cars will run on new, clean fuels and they will go very fast. E. No one can predict what our world will look like in the near future. F. So many changes have taken place in this planet that there will be no life existing on it. G. Instead, people will choose a program from a "menu" and a computer will send the program directly to the television. |
Futurologists (未来学家) predict that life will probably be very different in 2050.
TV channels will have disappeared. {#blank#}1{#/blank#} Today, we can use the World Wide Web to read newspaper stories and see pictures on a computer thousands of kilometers away. By 2050, music, films, programs, newspapers and books will come to us by computer.
{#blank#}2{#/blank#} Cars will have computers to control the speed and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination.
{#blank#}3{#/blank#} Many factories already use robots. Big companies prefer robots—they don't ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere—in factories, schools, offices, hospitals, shops and homes.
{#blank#}4{#/blank#} Today, there are devices (设备) that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people to see and hear again with the help of new technology.
Scientists will have discovered how to control genes. {#blank#}5{#/blank#} By 2050, scientists will be able to produce clones of people, and decide how they look, how they behave and how clever they are. Scientists will be able to do these things, but should they?
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