题目内容
（请给出正确答案）
A light-sensing input device that reads printed text and graphics and then translates the results into a form. the computer can use is called a ().
A、bar code reader
B、scanner
C、camera
D、microphone
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更多“A light－sensing input device that reads printed text and graphics and then translates”相关的问题
Digital camera needs focusing the receiving light on the light-sensing device.
A．Y
B．N
C．NG
HTML中，以下＜inpu＞标记的type属性值(44)在浏览器中的显示不是按钮 形式。
A.submit
B.button
C.password
D.reset
Inpu Box函数返回值的类型为（）。
A. 数值
B. 字符串
C. 变体
D. 数值或字符串(视输入的数据而定)
The basic units of a computer sysiem are as follows: () .
A.CPU, memory and disk
B.CPU, input and output
C.CPU, memory and ALU
D.CPU, memory and I/O system
(24）假定用下面的语句打开文件：
Open"File l .txt"For Input As＃1
则不能正确读文件的语句是
A）Input # 1, ch$
B）Line Input # 1, ch$
C）ch$＝Input$(5, # 1)
D）Read # 1, ch$
用PHP获取下面表单数据正确的是 ＜form action="login.php" method="post"＞ 账号: ＜input type="text" name="username" /＞ 密码: ＜input type="password" name="userpass" /＞ 验证码: ＜input type="text" name="code" /＞ ＜input type="submit" value="”登录”/" /＞ ＜/form＞
A、$_REQUEST[‘userpass’]用于获取密码
B、$_POST[‘code’]用于获取验证码
C、$_POST[‘userpass’]用于获取密码
D、$_POST[‘text’]用于获取账号
按照公式T=M!/N!(M-N)!计算T的值，请将程序填写完整。 ***主程序MAIN.PRG*** I=1 INPUT“请输入M的值：”TOM INPUT“请输入N的值：”TON DO PP1 WTTH 【 】 T=I DO PP1 WITH【 】 T=T/I DO PP1 WITH【 】 T=T/I ？“T=”，T RETURN ***下面为子程序PP1*** PARAMETERS Y STORE 1 TO M,I DO WHILE【 】 I=I*M M=M+1 ENDDO RETURN
请根据短文的内容，回答题。
Making Light of Sleep
All we have a clock located inside our brains. Similar to your bedside alarm clock, your intemal clock runs on a 24-hour cycle.-This cycle, called a circadian rhythm, helps control when you wake,when you eat and when you sleep.＜br＞
Somewhere around puberty, something happens in the timing of the biological clock. The clock pushes forward, so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it&39;s time for bed, your body may be pushing you to stay up for several hours more.＜br＞
And the light coming from your computer screen or TV could be pushing you to stay up even later.＜br＞
This shift is natural for teenagers. But staying up very late and sleeping late can get your body&39;s clock out of sync with the cycle of light and dark. It can also make it hard to get out of bed in the morning and may bring other problems, too. Teenagers are put in a kind of a gray cloud when they don&39;t get enough sleep, says Mary Carskadon, a sleep researcher at BrownUniversity. It affects their mood and their ability to think and learn.＜br＞
But just like your alarm clock, your internal clock can be reset. In fact, it automatically resets itself every day. How？ By using the light it gets through your eyes. Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks. For years,researchers thought that the signals that synchronize the body&39;s clock were handled through the same pathways that we use to see.＜br＞
But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether it&39;s day or night.
The clock located inside our brains is similar to our bedside alarm clock because __________. 查看材料
A.it controls when we wake， when we eat and when we sleep
B.it has a cycle of 24 hours
C.it is a cycle also called circadian rhythm
D.it can alarm any time during 24 hours
Blind from birth, Wonder has waited his whole life for a chance to see. Recently, Wonder visited Mark Hamayan, a vision specialist. He thought that a new device currently being studied by Humayan might offer him that chance.
The device, a retinal prosthesis, is a tiny computer chip implanted inside a patient's eye. The chip sends images to the brain and allows some sightless people to see shapes and colors. Wonder hoped the retinal prosthesis might work for him. "I've always said that if ever there's possibility of my seeing," said Wonder, "then I would take the challenge."
Unfortunately for Wonder, that challenge will have to wait. Humayan explained that the device isn't ready for people who have been blind since birth. Their brains may not be able to handle signals from a retinal prosthesis because their brains have never handled signals from a healthy eye.
The retinal prosthesis and other devices, however, show great promise in helping many other sightless people who once had vision see again. Perhaps one day soon, some formerly sightless people may be in Wonder's audience looking up—and seeing him—for the very first time.
Wonder's willingness to take part in retinal prosthesis studies and the results of those studies are giving new hope to people who thought they would be blind for the rest of their lives. More than one million people in the United States are considered legally blind, meaning that their eyesight is severely impaired. Another one million are totally blind.
Two types of specialized cells in the retina—rods and cones—are critical for proper vision. Light enters the eye and falls on the rods and cones in the retina. Those cells convert the light to electrical signals which travel through the optic nerve to the brain. The brain interprets those signals as visual images. Rods detect light at low levels of illumination. For instance, rods allow you to see faint shadows in dim moonlight. Cones, on the other hand, are most sensitive to color. Some diseases can damage cells in the retina. For instance, macular degeneration causes blindness and other vision problems in 700,000 people in the United States each year. The condition is caused by a lack of adequate blood supply to the central part of the retina. Without blood, the rods, cones, and other cells in the retina die.
Devices such as the retinal prostheses won't prevent or cure our eye diseases, but they may help patients who have eye disorders regain some of their vision. Different forms of retinal prostheses are currently being developed. On one type, a tiny computer chip is embedded in the eye. The chip has a grid of about 2,500 light-sensing elements called pixels.
Light entering the eye strikes the pixels, which convert the light into electrical signals. The pixels then send the electrical signals to nerve cells behind the retina. Those cells send signals via the optic nerve to the brain for interpretation.
Many people who have had a retinal prosthesis implanted say they can see shapes, colors, and movements that they couldn't see before. "It was great," said Harold Churchey, who received his retinal prosthesis 15 years after he became totally blind. "To see light after so long—it was just wonderful. It was just like switching a light on."
(572 words. Current Science. April 7, 2000)
Why did stevie Wonder visit Mark Humayan？
A．He thought Mark's device might give him the ability to see.
B．He thought Mark might need his help in developing the device.
C．He thought Mark might want to listen to his Superstition.
D．He thought Mark might implant a chip into his right eye.
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