Before you turn off your computer, you must _...

Before you turn off your computer, you must ________ the document.

A. keep B. hold C. stay D. save

七年级英语单选题中等难度题查看答案及解析

Want a good night's sleep? Then turn off your computer, cell phone or PSP two hours before you go to bed.

These things have bright lights. When our eyes see bright lights just before sleep, our sleep patterns (模式) change, a study has found.

Our body clock starts shutting us down for bed at 9 or 10 pm. But bright lights make our minds think that it is still daytime. That wakes us up and leaves us sleepless, experts say.

But if you read a paper book before sleeping, you won't have this problem. This is because light from a bedside lamp (台灯) does not go straight into our eyes.

Also, if you are watching a television from across the bedroom, you won't have problems falling asleep. The TV sends light to us from a distance, so the light won't be as strong.

1.The writer tells us to turn off the computer________before bed time.

A. half an hour     B. an hour        C. two hours       D. three hours

2.Which of the following may make us sleepless?

A. Reading a newspaper.                 B. Talking on QQ.

C. Reading a book.                      D. Watching TV.

3.Why can't we sleep well if we use a computer before bed time?

A. We think it is daytime if we leave computers on.

B. We feel too excited to sleep after using computers.

C. Lights from computers are brighter than other lights.

D. Lights from computers can change our sleep patterns.

七年级英语阅读理解困难题查看答案及解析

Don’t forget　　 off the computer when you leave the room, Jim.

A. turn 　　　　　　　　 B. turns

C. turning 　 　　　　　　 D. to turn

七年级英语单项填空中等难度题查看答案及解析

—Remember 　　　　　　 the lights before you leave the classroom.

—Yes, I will.

A.turning on B.to turn off C.turning off D.to turn on

七年级英语单选题中等难度题查看答案及解析

Please turn off the light ________ you leave the classroom.

A. unless B. while C. before D. after

七年级英语单选题中等难度题查看答案及解析

-- Don’t forget to turn off all the lights before you leave.

--- ___________________.

A. Yes, I do B. No, I don’t

C. Yes, I will D. No, I won’t.

七年级英语单项填空中等难度题查看答案及解析

Have you ever turned off your alarm clock on the weekend to hope that it would pay off your weekly sleep debt (债 )? A study in Current Biology may crush those hopes, which means the catch-up sleep weekend is not helpful. The bad health effects of sleep deprivation ( 缺乏 ) on weekdays cannot be repaid by long weekend sleep.

According to a study by the University of Colorado, participants who took part in the study only slept for five hours on weekdays while sleeping as much as they wanted during a weekend. To our surprise, they got nearly three pounds over two weeks and experienced metabolic disruption (代谢混乱) that would make them become ill easily.

“If there are benefits of catch-up sleep, they’re gone when you go back to your routine. It’s very short-lived,” said Kenneth Wright, director of the sleep laboratory. “These health effects are long-term. It’s kind of like smoking once was—people would smoke and wouldn’t see an immediate effect on their health, but people will say now that smoking is not a healthy lifestyle choice.”

Kenneth Wright said that the study suggests sleep should come first, especially for the people spending a lot of time in watching television or on smart phones. “Even when people don’t have a choice about losing sleep because of child-care responsibilities or job schedules, they should think about sleep in the same way they think about a healthy diet or exercise.”

Michael Grandner, the sleep program director at the University of Arizona College of Medicine, said,“Imagine a person who ate nothing but cheeseburgers and French fries, Monday through Friday, but only had vegetables on weekends and tried to call that a healthy diet. That is just what people are doing when they sleep less on weekdays with the idea that they can make up for it on the weekend,” he argued.

Some other researchers found an interesting difference between men and women, in which women got less recovery sleep on the weekend, and they also were able to control their eating behavior better than men on weekends.

1.The word “crush” in Paragraph 1 probably means ________.

A.build B.break C.show D.take

2.Which of the following is TRUE according to Kenneth Wright?

A.People who sleep less would become fatter.

B.The catch-up sleep is helpful over the long term.

C.Sleep is as important as a healthy diet and exercise.

D.People who keep to their routines would be healthy.

3.What is the main purpose of this passage?

A.To give us some advice on weekday sleep.

B.To encourage us to sleep more on weekends.

C.To share researchers’ unhappy experiences of sleep.

D.To introduce some researches on weekend catch-up sleep.

七年级英语阅读单选中等难度题查看答案及解析

First, ____ the printer____the computer. Then you can print your document.

A.turn; on　　 　 B.connect; to

C.turn off　　　　 D.connect; for

七年级英语单项填空中等难度题查看答案及解析

―Don’t forget to take your bag when you _______ the bus.

―OK, I won’t.

A.get off B.take off

C.turn off D.show off

七年级英语单选题简单题查看答案及解析

Don’t forget to take your bag when you _________ the bus.

A. get off　　　　 　　　　 B. take off

C. turn off　　　　　　　 D. put off

七年级英语单项填空简单题查看答案及解析