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英语谚语“Let sleeping dogs lie.” 意思是不要自找麻烦。然而，匈牙利科学家发现了另一个让狗继续沉睡的理由——狗睡觉的时候也在学习。
There is an English proverb that says， “Let sleeping dogs lie.” It means not to bring up an old problem. Researchers in Hungary have found another reason to let dogs keep on sleeping. It seems that the animals are learning while they sleep.
The scientists placed wires on the dogs heads to measure electrical activity in their brains. The brain activity， called sleep spindles， takes place in human beings， and has been linked with learning.
The Hungarian scientists hope to understand how the dogs ability to learn and remember changes as they get older. The study may help researchers understand how human brains change as we age. Ivaylo Iotchey is a neuroscience researcher. He says that this is the first time dogs sleep spindles have been measured， and related to the dogs learning new things.
“From studies with humans and rodents （啮齿动物）， we know that they are not only extremely useful markers of memory and cognition but also of aging and activity. In the dog， sleep spindles have only been described， they were never quantified， they were never related to function. This is the first time we were able to show that sleep spindles predict learning in the dog.”
The scientists found differences between male and female dogs. Iotchey says the females appeared much better at learning new things. “Female dogs have approximately， on average， twice as many spindles per minute as male dogs，and they also happen to be the better learners; they memorize the task much better.”
“But it was harder for all the older dogs to remember things， especially when several things were happening at the same time. Also， the older dogs were easily tricked. If we first hide the reward into one pot， then in another and in an?other， they get confused after a while. So their performance is declining， and they are getting less effective in solving novel problems and shifting from one task to another.”
Researchers hope the study will not only help understand the cognitive ability and memory changes in dogs， but also the aging process in humans.
[Reading][Check]
1. Why is the proverb about sleeping dogs mentioned in the first paragraph？
A. To warn people to stay away from sleeping dogs.
B. To lead in the topic of the text.
C. To show why dogs keep on sleeping.
D. To prove that the proverb is correct. 2. Why are wires placed on the dogs heads？
A. To help the dogs learn.
B. To help the dogs sleep well.
C. To measure their brain activity.
D. To diagnose the dogs diseases.
3. Which of the following is true about sleep spindles？
A. They predict learning in the dog.
B. They are mainly markers of memory and cognition.
C. They are mainly markers of aging and activity.
D. They are linked with sleep quality.
4. Studies show that
There is an English proverb that says， “Let sleeping dogs lie.” It means not to bring up an old problem. Researchers in Hungary have found another reason to let dogs keep on sleeping. It seems that the animals are learning while they sleep.
The scientists placed wires on the dogs heads to measure electrical activity in their brains. The brain activity， called sleep spindles， takes place in human beings， and has been linked with learning.
The Hungarian scientists hope to understand how the dogs ability to learn and remember changes as they get older. The study may help researchers understand how human brains change as we age. Ivaylo Iotchey is a neuroscience researcher. He says that this is the first time dogs sleep spindles have been measured， and related to the dogs learning new things.
“From studies with humans and rodents （啮齿动物）， we know that they are not only extremely useful markers of memory and cognition but also of aging and activity. In the dog， sleep spindles have only been described， they were never quantified， they were never related to function. This is the first time we were able to show that sleep spindles predict learning in the dog.”
The scientists found differences between male and female dogs. Iotchey says the females appeared much better at learning new things. “Female dogs have approximately， on average， twice as many spindles per minute as male dogs，and they also happen to be the better learners; they memorize the task much better.”
“But it was harder for all the older dogs to remember things， especially when several things were happening at the same time. Also， the older dogs were easily tricked. If we first hide the reward into one pot， then in another and in an?other， they get confused after a while. So their performance is declining， and they are getting less effective in solving novel problems and shifting from one task to another.”
Researchers hope the study will not only help understand the cognitive ability and memory changes in dogs， but also the aging process in humans.
[Reading][Check]
1. Why is the proverb about sleeping dogs mentioned in the first paragraph？
A. To warn people to stay away from sleeping dogs.
B. To lead in the topic of the text.
C. To show why dogs keep on sleeping.
D. To prove that the proverb is correct. 2. Why are wires placed on the dogs heads？
A. To help the dogs learn.
B. To help the dogs sleep well.
C. To measure their brain activity.
D. To diagnose the dogs diseases.
3. Which of the following is true about sleep spindles？
A. They predict learning in the dog.
B. They are mainly markers of memory and cognition.
C. They are mainly markers of aging and activity.
D. They are linked with sleep quality.
4. Studies show that