题目内容：

    When we wake up feeling sleepy and with dark circles under eyes, many of us often think "I'm going to go to bed earlier tomorrow!" But however determined (有决心的) we are. Chances are that we don't stick to our promise.

This behavior is called "bedtime procrastination (拖延症) , and results from lack of (缺乏) self-control and our body clock. Reported Huffpost.

According to a study carried out by a group of health psychologists at Utrecht University in the Netherlands (荷兰)in 2014, bedtime procrastination is a common problem. In their study, 53 percent of the2, 400participants (参与者)said they didn't follow their sleep schedule (日程) , delaying (延迟) it at last twice a week.

It's found that they delayed bedtime not because they liked to stay up late, but they couldn't stop doing other trivial (琐碎的) things, which were keeping them up in he first place.

"People who generally have trouble fighting against temptations (诱惑) and sticking to their intentions (意图) are also more likely to delay going to bed, "Floor Kroese, a psychologist at Utrecht University, further explained to HuffPost.

Yet, according to scientists, lack of self-control is not the only thing to blame (责备) . Our body clock also plays an important role when it comes to bedtime.

In order to check the influence of the body clock on sleep, psychologists at Um University in Germany studied the sleep patterns (模式)of 108 people in February. It was found that those who get up late are more likely to postpone their bedtime than those who wake early every morning.

And more surprisingly, night owls (夜猫子) would go to bed late at the very beginning of the weekday, even though they had to get up early for work and school. It's their special body cock that plays a part in delaying their bedtime, reported Popular Science.

1.What does the underlined word "postpone" in Paragraph 7 probably mean?

A.make changes about B.forget about C.put away D.put off

2.What did the study by Utrecht University find?

A.53 percent of the participant delay their bedtime every day.

B.The lack of self-control is the only reason for bedtime procrastination.

C.Bedtime procrastination is particularly common among the Dutch

D.They delayed bedtime because they kept doing trivial things.

3.What's the best title of this passage?

A.A common problem B.A study carried out by psychologists

C.Bedtime procrastination D.Our special body clock