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You're asleep on a Saturday morning when the sound of an alarm clock erupts from your device.You turn over to see the word SNOOZE projected in the air above your device.You reach out and touch the virtual button with your finger-a slight feeling on your fingertip-before falling back to sleep.
    Researchers from the University of Tsukuba in Japan are working on a technology that could make this possible.Led by associate professor Yoichi Ochiai,the team creates shapes in the air using a laser(激光)that releases short pulses(脈沖)of light.The high-intensity light can break down air molecules(分子),which produces short-lived spots of light.The system polishes images by rapidly adjusting the central point of the laser in three dimensions.
    A previous version of the technology used nano-second laser pulses,which have the unfortunate side effect of burning human skin.Ochiai' s system,named Fairy Lights,employs much shorter laser pulses that are much less dangerous despite having a high peak intensity,Ochiai says.The tiny hearts,stars and fairies that the system projects are not only safe to touch,but they are sensitive to contact.In one test,the system projects a checkbox that can be filled in with your finger. "It feels like sandpaper or a mild electric shock, " Ochiai says.
    Ochiai also predicts large-scale emergency monitors that could be projected high over a city to wan residents about a natural disaster or direct them toward an escape route.While the initial images were not large,Ochiai says the flexibility of the system depends on the size and power of the equipment used.Large systems are currently expensive,he says,adding that technologies that draw images will likely become more achievable over the next 10 to 20 years as the multi-million-dollar price decreases.

(1)What is the author's purpose of writing paragraph 1?
D
D

A.To describe a scene of sleep-in.
B.To promote a high-tech alarm clock.
C.To explain the function of a project.
D.To introduce the use of a new technology.
(2)What can we infer from paragraph 2?
A
A

A.Images can be projected in the air.
B.Shapes can be released by pulses of light.
C.The system can be adjusted in three dimensions.
D.Air molecules can be broken down in a short time.
(3)What do we know about Fairy Lights?
A
A

A.It projects images safe to touch.
B.It brings benefits to human skin.
C.It employs nano-second laser pulses.
D.It becomes sensitive to electric currents.
(4)According to paragraph 4,Ochiai might agree that
C
C
.
A.The technology will be put in use in a decade or two
B.The technology can accurately predict natural disasters
C.The system can inform people of a safer escape route
D.The more flexible the system is,the larger the image will be

【考點】社會;說明文
【答案】D;A;A;C
【解答】
【點評】
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發(fā)布:2025/1/1 15:0:2組卷:7引用:2難度:0.7
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    發(fā)布:2025/1/30 8:0:1組卷:0引用:1難度:0.5
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