One day, gardeners might not just hear the buzz of bees among their flowers, but the whirr of robots, too. Scientists have managed to turn an unassuming drone into a remote-controlled pollinator by attaching horsehairs coated with a special, sticky glue to the under part of it.
Animal pollinators are needed for the reproduction of 90% of flowering plants and one third of human food crops. Chief among those are bees-but many bee populations in the United States have been in steep decline in recent decades. Thus, the decline of bees isn't just worrisome because it could spoil ecosystems. but also, because it could spoil agriculture and economy. People have been trying to come up with replacement techniques, but none of them are especially effective yet.
Scientists have thought about using drones, but they haven't figured out how to make free-flying robot insects that can rely on their own power source without being attached to a wire. “It’s very tough work." said Senior author Elijio Miyako, a chemist at the National Institute of Advanced Industrial Science and Technology. His particular contribution to the field involves a kind of glue, one he'd considered a mistake 10 years before and stuck in a storage cabinet. When it was rediscovered a decade later, it hadn't dried up or broke down at all. “I was so surprised because it still had high viscosity,” Miyako said.
The chemist noticed that when dropped, the glue absorbed an impressive amount of dust from the floor. Miyako realized this material could be very useful for picking up pollen. He and his colleagues chose a drone and attached horsehairs to its smooth surface to imitate a bee's furry body. They coated those horsehairs in the glue, and then controlled the drones over flowers, where they would pick up the pollen from one flower and then deposit the pollen at another one, thus fertilizing it.
The scientists looked at the hairs under a scanning electron microscope and counted up the pollen grains attached to the surface and found that the drones whose horsehairs had been coated with the glue had about 10 times more pollen than those that had not been coated with the glue.
Mivako does not think such drones would replace bees altogether, but could simply help bees with their pollinating duties. There’s a lot of work to be done before that's a reality, however. Small drones will need to become more controllable and energy efficient, as well as smarter, with better GPS and artificial intelligence.
1.What does the underlined word “viscosity” in Para.3 probably mean?
A.Hardness. B.Stickiness.
C.Flexibility. D.Purity.
2.We can learn from the passage that .
A.bees disturb both agriculture and economy
B.scientists invented automatic robot insects
C.Miyako found the special feature of the glue accidently
D.bees in the United States are on the edge of extinction
3.A drone works best in picking up pollen when ___
A.it is coated with the glue B.its body is made like a bee's
C.researchers control it precisely D.horsehairs with the glue are attached to it
4.According to Eijiro Miyako, the drones____
A.are not yet ready for practical use B.may eventually replace bees in the future
C.are much more efficient than bee pollinators D.can provide a solution to economic depression
高三英语阅读理解中等难度题
One day, gardeners might not just hear the buzz of bees among their flowers, but the whirr of robots, too. Scientists have managed to turn an unassuming drone (无人机) into a remote-controlled pollinator (授粉媒介) by attaching horsehairs coated with a special, sticky gel to its underbelly.
Animal pollinators are needed for the reproduction of 90% of flowering plants and one third of human food crops. Chief among those are bees — but many bee populations in the United States have been in steep decline in recent decades. Thus, the decline of bees isn't just worrisome because it could disrupt ecosystems, but also because it could disrupt agriculture and economy. People have been trying to come up with replacement techniques, but none of them are especially effective yet.
Scientists have thought about using drones, but they haven't figured out how to make free-flying robot insects that can rely on their own power source without being attached to a wire. “It’s very tough work,” said senior author Eijiro Miyako, a chemist at the National Institute of Advanced Industrial Science and Technology. His particular contribution to the field involves a gel, one he’d considered a mistake 10 years before and stuck in a storage cabinet. When it was rediscovered a decade later, it hadn’t dried up or degraded at all. “I was so surprised because it still had high viscosity,” Miyako said.
The chemist noticed that when dropped, the gel absorbed an impressive amount of dust from the floor. Miyako realized this material could be very useful for picking up pollen (花粉). He and his colleagues chose a drone and attached horsehairs to its smooth surface to mimic a bee’s fuzzy body. They coated those horsehairs in the gel, and then controlled the drones over lilies, where they would pick up the pollen from one flower and then deposit the pollen at another one, thus fertilizing it.
The scientists looked at the hairs under a scanning electron microscope and counted up the pollen grains attached to the surface and found that the drones whose horsehairs had been coated with the gel had about 10 times more pollen than those that had not been coated with the gel.
Miyako does not think such drones would replace bees altogether, but could simply help bees with their pollinating duties. There’s a lot of work to be done before that's a reality, however. Small drones will need to become more controllable and energy efficient, as well as smarter, with better GPS and artificial intelligence.
1.What does the underlined word “viscosity” in Para.3 probably mean?
A.Hardness. B.Stickiness.
C.Flexibility. D.Purity.
2.We can learn from the passage that ______.
A.bees disrupt both agriculture and economy
B.scientists have invented self-powered robot insects
C.bees in the United States are on the edge of extinction
D.Miyako found the special feature of the gel by chance
3.A drone works best in picking up pollen when ______.
A.its body is made like a bee’s
B.its GPS works more efficiently
C.some flowers are coated with the gel
D.horsehairs with the gel are attached to it
4.According to Eijiro Miyako, the drones ______.
A.are not yet ready for practical use
B.may eventually replace bees in the future
C.are much more efficient than bee pollinators
D.can provide a solution to economic depression
高三英语阅读理解困难题查看答案及解析
One day, gardeners might not just hear the buzz of bees among their flowers, but the whirr of robots, too. Scientists have managed to turn an unassuming drone into a remote-controlled pollinator by attaching horsehairs coated with a special, sticky glue to the under part of it.
Animal pollinators are needed for the reproduction of 90% of flowering plants and one third of human food crops. Chief among those are bees-but many bee populations in the United States have been in steep decline in recent decades. Thus, the decline of bees isn't just worrisome because it could spoil ecosystems. but also, because it could spoil agriculture and economy. People have been trying to come up with replacement techniques, but none of them are especially effective yet.
Scientists have thought about using drones, but they haven't figured out how to make free-flying robot insects that can rely on their own power source without being attached to a wire. “It’s very tough work." said Senior author Elijio Miyako, a chemist at the National Institute of Advanced Industrial Science and Technology. His particular contribution to the field involves a kind of glue, one he'd considered a mistake 10 years before and stuck in a storage cabinet. When it was rediscovered a decade later, it hadn't dried up or broke down at all. “I was so surprised because it still had high viscosity,” Miyako said.
The chemist noticed that when dropped, the glue absorbed an impressive amount of dust from the floor. Miyako realized this material could be very useful for picking up pollen. He and his colleagues chose a drone and attached horsehairs to its smooth surface to imitate a bee's furry body. They coated those horsehairs in the glue, and then controlled the drones over flowers, where they would pick up the pollen from one flower and then deposit the pollen at another one, thus fertilizing it.
The scientists looked at the hairs under a scanning electron microscope and counted up the pollen grains attached to the surface and found that the drones whose horsehairs had been coated with the glue had about 10 times more pollen than those that had not been coated with the glue.
Mivako does not think such drones would replace bees altogether, but could simply help bees with their pollinating duties. There’s a lot of work to be done before that's a reality, however. Small drones will need to become more controllable and energy efficient, as well as smarter, with better GPS and artificial intelligence.
1.What does the underlined word “viscosity” in Para.3 probably mean?
A.Hardness. B.Stickiness.
C.Flexibility. D.Purity.
2.We can learn from the passage that .
A.bees disturb both agriculture and economy
B.scientists invented automatic robot insects
C.Miyako found the special feature of the glue accidently
D.bees in the United States are on the edge of extinction
3.A drone works best in picking up pollen when ___
A.it is coated with the glue B.its body is made like a bee's
C.researchers control it precisely D.horsehairs with the glue are attached to it
4.According to Eijiro Miyako, the drones____
A.are not yet ready for practical use B.may eventually replace bees in the future
C.are much more efficient than bee pollinators D.can provide a solution to economic depression
高三英语阅读理解中等难度题查看答案及解析
The driver tried everything he could think of, but the car just ________not move.
A.should B.might C.must D.would
高三英语单项填空中等难度题查看答案及解析
The driver tried everything he could think of, but the car just ______ not move.
A.should B.might C.must D.would
高三英语单项填空中等难度题查看答案及解析
Although one might not agree because of some of the criticism of it, advertising is essential to the kind of society in which people in the United Kingdom, and a very proportion of the world live. Advertising is necessary as a of communicating with others, of telling them about the goods and services that are offered, and of which most of them would never to hear at all if it were not for advertising. And advertising helps a great deal to promote a standard of living.
In talking about advertising, one should not think only a commercial on television, or an advertisement in the newspapers or periodicals. In its widest , advertising includes a host of other such as packaging, shop displays and--in the sense of communication--even the spoken word of the salesman. , the roots of advertising are to be found in the market place.
For many years it was thought that it was enough to goods and supply services, it is only more that it has become increasingly understood that the production of goods is a waste of resources those goods can be sold at a fair price within a time span. In the competitive society in which we live, it is essential that we go out and sell what we have to offer, and advertising plays an important role in this respect, whether selling at home or in markets.
Approximately 2 percent of the UK gross national product (GDP) is spent on advertising. But it must not be thought that this advertising tries to sell goods to consumers who do not want them. Of course, advertising does try to attract the interest of the consumer, but if the articles when does not match up to the standards that the advertising suggests that it will, it is obviously exceedingly unlikely that the article will sell well.
1.A. enjoyable B. considerable C. agreeable D. knowledgeable
2.A. data B. proportion C. means D. message
3.A. get B. put C. find D. avoid
4.A. demanding B. raising C. declining D. rising
5.A. in honor of B. in case of C. in terms of D. in favor of
6.A. sense B. border C. level D. extent
7.A. conferences B. activities C. matters D. actions
8.A. Of all B. In all C. Above all D. After all
9.A. protest B. program C. process D. produce
10.A. quickly B. immediately C. recently D. totally
11.A. unless B. though C. until D. when
12.A. inevitable B. comfortable C. reasonable D. available
13.A. country B. import C. job D. export
14.A. financial B. potential C. essential D. social
15.A. presented B. purchased C. responded D. respected
高三英语完形填空中等难度题查看答案及解析
The baby is just one day old and has not yet left hospital. She is quiet but alert (警觉). Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other, her gaze (凝视) starts to lose its focus — until a third, with three black spots, is presented. Her gaze returns: she looks at it for twice as long as she did at the previous card. Can she tell that the number two is different from three, just 24 hours after coming into the world?
Or do newborns simply prefer more to fewer? The same experiment, but with three spots shown before two, shows the same return of interest when the number of spots changes. Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects (a comb, a key, an orange and so on), changing the number of objects had an effect separate from changing the objects themselves. Could it be the pattern that two things make, as opposed to three? No again. Babies paid more attention to squares moving randomly on a screen when their number changed from two to three, or three to two. The effect even crosses between senses. Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two; likewise (同样地) when the researchers started with drumbeats and moved to spots.
1.The experiment described in Paragraph 1 is related to the baby’s ________.
A. sense of hearing B. sense of sight
C. sense of touch D. sense of smell
2.Babies are sensitive to the change in ________.
A. the size of cards
B. the color of pictures
C. the shape of patterns
D. the number of objects
3.Why did the researchers test the babies with drumbeats?
A. To reduce the difficulty of the experiment.
B. To see how babies recognize sounds.
C. To carry their experiment further.
D. To keep the babies’ interest.
4.Where does this text probably come from?
A. Science fiction.
B. Children’s literature.
C. An advertisement.
D. A science report.
高三英语阅读理解中等难度题查看答案及解析
The baby is just one day old and has not yet left hospital. She is quiet but alert (警觉). Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other, her gaze(凝视) starts to lose its focus - until a third, with three black spots, is presented. Her gaze returns; she looks at it for twice as long as she did at the previous card. Can she tell that the number two is different from three, just 24 hours after coming into the world?
Or do newborns simply prefer more to fewer? The same experiment, but with three spots shown before two, shows the same return of interest when the number of spots changes. Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects(a comb, a key, an orange and so on), changing the number of objects had an effect separate from changing the objects themselves. Could it be the pattern that two things make, as opposed to three? No again. Babies paid more attention to squares moving randomly on a screen when their number changed from two to three, or three to two. The effect even crosses between senses. Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two; likewise(同样地) when the researchers started with drumbeats and moved to spots.
1.The experiment described in Paragraph 1 is related to the baby’s ______.
A.sense of hearing.
B.sense of sight.
C.sense of touch.
D.sense of smell.
2.Babies are sensitive to the change in ______.
A.the size of cards.
B.the colour of pictures.
C.the shape of patterns.
D.the number of objects.
3.Why did the researchers test the babies with drumbeats?
A.To reduce the difficulty of the experiment.
B.To see how babies recognize sounds.
C.To carry their experiment further.
D.To keep the babies’ interest.
4.Where does this text probably come from?
A.Science fiction.
B.Children’s literature.
C.An advertisement.
D.A science report.
高三英语阅读理解简单题查看答案及解析
The baby is just one day old and has not yet left hospital. She is quiet but alert(警觉). Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other, her gave(凝视)starts to lose its focus-until a third, with three black spots, is presented. Her gaze returns: she looks at it for twice as long as she did at the previous card. Can she tell that the number two is different from three, just 24 hours after coming into the world?
Or do newborns simply prefer more to fewer? The same experiment, but with three spots shown before two, shows the same return of interest when the number of spots changes. Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects (a comb, a key, an orange and so on), changing the number of objects had an effect separate from changing the objects themselves. Could it be the pattern that two things make, as opposed to three? No again. Babies paid more attention to squares moving randomly on a screen when their number changed from two to three, or three to two. The effect even crosses between senses. Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two; likewise(同样地)when the researchers started with drumbeats and moved to spots.
1.Babies are sensitive to the change in _______.
A. the size of cards
B. the colour of pictures
C. the shape of patterns
D. the number of objects
2.Why did the researchers test the babies with drumbeats?
A. To reduce the difficulty of the experiment
B. To see how babies recognize sounds
C. To carry their experiment further
D. To keep the babes interest.
3.Where does this text probably come from?
A. Science fiction B. Children’s literature
C. An advertisement D. A science report
高三英语阅读理解中等难度题查看答案及解析
The baby is just one day old and has not yet left hospital. She is quiet but alert (警觉). Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other, her gaze(凝视) starts to lose its focus — until a third, with three black spots, is presented. Her gaze returns: she looks at it for twice as long as she did at the previous card. Can she tell that the number two is different from three, just 24 hours after coming into the world?
Or do newborns simply prefer more to fewer? The same experiment, but with three spots shown before two, shows the same return of interest when the number of spots changes. Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects (a comb, a key, an orange and so on), changing the number of objects had an effect separate from changing the objects themselves. Could it be the pattern that two things make, as opposed to three? No again. Babies paid more attention to squares moving randomly on a screen when their number changed from two to three, or three to two. The effect even crosses between senses. Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two; likewise (同样地) when the researchers started with drumbeats and moved to spots.
1.The experiment described in Paragraph 1 is related to the baby’s__.
A. sense of hearing B. sense of sight
C. sense of touch D. sense of smell
2.Babies are sensitive to the change in______.
A. the size of cards B. the colour of pictures
C. the shape of patterns D. the number of objects
3.Why did the researchers test the babies with drumbeats?
A. To reduce the difficulty of the experiment.
B. To see how babies recognize sounds.
C. To carry their experiment further.
D. To keep the babies’ interest.
4.Where does this text probably come from?
A. Science fiction. B. Children’s literature.
C. An advertisement. D. A science report.
高三英语阅读理解中等难度题查看答案及解析
China might one day explore other planets, the ______designer of Chang’e-I told China Economic Weekly.
A. major B. main C. primary D. chief
高三英语单项填空中等难度题查看答案及解析