Basketball coaches waste no time to search for young players of great potential for better performances in the coming season.A. promising B. convincingC. desperate D. admirable 题目和参考答案——青夏教育精英家教网—

题目内容

Basketball coaches waste no time to search for ________ young players of great potential for better performances in the coming season.

A. promising B. convincing

C. desperate D. admirable

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There are as many as five student clubs in our school．You can join _____ interests you most．

A．whatever B．whichever

C．whenever D．wherever

Lights Out at Bedtime

There are plenty of good reasons to power up a personal desktop or laptop computer in the evening — writing e-mails，chatting on social networks or making purchases over the Internet，for instance．But various studies indicate that people who stare at a PC’s bright monitor shortly before going to bed probably sleep less soundly than they would otherwise because the light seriously affects their natural wake-sleep cycle．"They haven't proved it though，" says Dieter Kunz，the team's director at Charite's Psychiatric Clinic in St．Hedwig's Hospital in Berlin．

Similarly，exposure to just 10 minutes of normal bathroom lighting is enough to free the sleep hormone melatonin，which regulates people's natural wake-sleep cycle and makes them sleepy at nightfall．

Ten years ago，a team of British and American researchers detected a photo-pigment（光敏色素） in the human eye that signals to the body whether it is day or night，summer or winter．The photo-pigment is especially sensitive to blue light．

"The blue light more or less tells the body，'It's daytime，be awake，'" Kunz says．Monitors have a mostly cold white light content and scientists suspect the photo-pigment may react similarly to it．So the longer people look into the bright light，the more awake they become - and then sleep poorly．

A lot of people have difficulty "switching off" in the evening．About half of the women in Germany and a quarter of the men sleep poorly．

Environmental factors are only one of the possible causes．Job stress as well as personal and health concerns are also the main reasons for their sleep problems．

In addition，electronic objects' standby lights and indicator lamps can be annoying in the dark and affect sleep．"Sound scientific evidence is still lacking on this matter，" Kunz notes．

According to Kunz，those who cannot go without their computer in the evening should turn down the blue content if possible and lower the brightness somewhat．"But nobody does that because，after all，you want to concentrate while working at the computer and the light helps the brain．"

1.The passage is mainly about ____________．

A．natural wake-up cycles

B．the effect of light on sleep

C．personal and health concerns

D．functions of computer monitors

2.The underlined word “which” in Paragraph 2 refers to_____．

A．normal bathroom lighting

B．10-minute exposure to lighting

C．the release process of a chemical

D．a chemical affecting one’s sleep cycle

3.We can learn from the passage that ______．

A．the blue light has a calming effect．

B．the photo-pigment tells people day or night

C．women in Germany use computers more often than men

D．it has been proved that standby lights affect people’s sleep

短文改错（10分）

Dear Julie,

Last summer I volunteer in the Summer Camp for high school students. I have told that one more volunteer will be needed in this year and I think you are suitable for the job. Why not joining us? The camp is at a bottom of a mountain close to a beautiful river. It is such an amazing place, where we can hear bird singing happily .We can also cook for ourselves ,that is very exciting . We usually work a few hours a day , so we have a great many of spare time to play games and have fun. I am sure it will be a pleased experience. If you are interested at it , write to me soon.

Yours,

Amanda

—Have you got any job offers?

—No. I ________. Hopefully, I will get one by the end of this month.

A. waited

B. had been waiting

C. have waited

D. am waiting

Please tell me how the accident _______. I am still in the dark.

A. came up B. came out

C. came to D. came about

Between the two parts of the concert is an interval,________ the audience can buy ice-cream.

A. when B. where C. that D. which

He was unhappy when he sold his violin．After all，he ____________ it for a very long time．

A．has had B．had had C．has D．had

In China, a middle school’s success was _____ in terms of the number of students who got into university.

A. measured B. conquered

C. negotiated D. implied

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