Few things feel more like home than a warm bed on a winter morning. Don’t feel bad. You’re not alone in not wanting to leave it. Here’s what’s happening inside you and what you can do about it.

To start with, your vitamin(维生素) D levels are low. Vitamin D plays many roles in the body. Vitamin D levels drop because of shorter daylight hours and less powerful sun rays(光线). The shortage of Vitamin D can affect sleep, so you can’t wake up in the morning easily. Secondly, your melatonin(褪黑激素) levels are high. An increase in melatonin sends you off to sleep at night. Melatonin is produced for a longer time in winter when nights are long than in summer when nights are short. What’s more, researchers discovered cold temperatures can make your waking up hard, too. There are ways you can use to wake up early feeling refreshed.

Try getting more vitamin D. The first thing you can do to wake up earlier is to fight the shortage of Vitamin D. How? Try to get more sunshine. If the cold weather prevents you going outside, you can enjoy the sunshine next to an open window for five minutes. Lighting up your room in the mornings is the second thing you can do. Opening your bedroom lights in the morning is about more than making you too uncomfortable to keep sleeping. The body stops melatonin production when it starts to sense light, which makes you feel less tired. You can also put your heating on a timer. Then, increase the temperature about an hour before you want to wake up.

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1.What can’t be learned from Paragraph 2?

A Less light means worse sleep.

B Short days make you feel sleepier.

C The cold makes you feel less awake.

D Quieter environment makes you sleepier.

解析：选D。D细节理解题。通读第二段，第一到四句描述的是冬天光照时间短导致人体内维生素D水平下降，从而影响睡眠质量；第五到七句描述的是冬天黑夜长白昼短，导致人体内褪黑素水平高，人容易犯困；第八句描述的是冬天的低温让人更不愿意醒来。因此只有D项未被提及。故选D。

2.What does the underlined word “affect” mean?

A Polish.

B Boil.

C Influence.

D Divide.

解析：选C。C词义猜测题。根据划线部分后面的“so you can’t wake up in the morning easily”可知，缺少维生素D会影响睡眠，这使得你早上起床困难。故选C。

3.What does the writer advise us to do in the cold weather?

A To do more exercise inside the door.

B To keep the lights on the whole morning.

C To get more sunshine near an open window.

D To make the room warm after you wake up.

解析：选C。C细节理解题。根据第三段的“If the cold weather prevents you going outside, you can enjoy the sunshine next to an open window for five minutes.”可知，如果寒冷的天气使你无法外出，那么你可以在开着的窗户旁晒五分钟太阳浴。故选C。

4.What is Paragraph 3 mainly about?

A Ways of making winter wake-ups easier.

B Why are we always tired and sleepy in winter?

C Why is it so hard for us to wake up in the winter?

D The reasons why some people love the winter.

解析：选A。A段落大意题。该段主要讲了一些如何能在冬天早起的方法。故选A。

5.In which section of a newspaper may this text appear?

A People.

B Health.

C Culture.

D Business.

解析：选B。B推理判断题。本文告诉我们为什么冬天起床比夏天困难以及解决办法，属于健康方面的。故选B。