little sleep tends to leave people feeling bad­tempered and stressed.It means that little things that might not normally be a big deal can cause you to fly_off_the_handle.The result is more misunderstandings with those around you.Being well rested, on the other hand, will help you control your temper and you'll get along better with others.

　　According to AAA Foundation reports, people who sleep six to seven hours are twice as likely to have a car accident as those who sleep for eight hours or more when driving.People who sleep for five hours or less increase their risk up to fivefold.Go for 24 hours without sleeping, and your skills behind the wheel are the same as someone who is drunk.

　　Research suggests that the less sleep you get, the more likely you are to be overweight.How so? When you lack sleep, you have less energy to exercise or make healthy food choices.Plus, studies show that the later you stay up, the more you eat.Night owls who stay up until 4 a．m.eat about 550 more calories than early birds who go to sleep at 10 p．m.

　　语篇解读：本文为说明文。晚睡有害健康，因此我们一定要尽量早一点睡，这样才能保持身体健康。

　　5．According to Paragraph 2, not getting enough sleep can ________.

　　A．affect your living habits

　　B．make you become pessimistic

　　C．make you suffer from diseases

　　D．make you lose interest in everything

　　解析：选B　推理判断题。由第二段"The findings suggest that sleep disruption (扰乱)．..negative thoughts."可知，睡眠不足可能会让你变得悲观。

　　6．What does the underlined part "fly off the handle" in Paragraph 3 mean?

　　A．Fly away.　　　　　　 B．Get very angry.

　　C．Become very busy. D．Become disappointed.

　　解析：选B　词义猜测题。由第三段画线部分前后的"Too little sleep tends to leave people feeling bad­tempered and stressed."以及"The result is more misunderstandings with those around you."可推断，画线部分是指"发怒"。

　　7．According to the last two paragraphs, people who lack sleep ________.

　　A．care less about their safety

　　B．are more likely to get drunk

　　C．cook at home much more frequently

　　D．may find it hard to keep a healthy weight

解析：选D　细节理解题。由最后一段"Research suggests that the less sleep you get, the