Read the following article and select the best answer. Article: It's a time when school,homework,active social lives and pare-time jobs keep teenagers busy from early in the morning until late at night.They are likely to try to make up for a lack of sleep by "sleeping in" on the weekends.Unfortunately,this causes irregular sleep and actually makes the problem worse. Most teenagers are not able to fall asleep until late at night.Since many teens aren't sleepy until around 11 pm.but need to be at school by 7:30 or 8:00 am .They cannot get enough sleep .During puberty ,the biological clock in the brain naturally re-sets to a later time ,and this causes teens to fall asleep later.Then ,when it's time to get up ,a teen's body clock is likely to still be producing the night-time hormones .This makes it hard for them to feel active and energetic in the morning. A growing body of research suggests that starting high school later improves attendance,achievements and grades.A few years ago in an important study ,test scores on the SAT college entrance exams in Edina,Minnesota jumped more than 100 points on average,when the morning school bell rang an hour later.Unfortunately,most schools are not set up to start later and fail to satisfy teen's sleep needs. Question: The text helps us to know more about teenagers' _ . - daytime activities - sleeping habits - mental problems - studying methods
sleeping habits

Read the following article and select the best answer. Article: A 44-year-old Swedish man, Peter Skyllberg, was found in a car buried under snow, at the end of a forest track more than 1 km from a main road in northern Sweden. He survived for two months without food by eating handfuls of snow. But how long can people go without food? Skyllberg had been inside the car since 19 December, 2011. Experts believe it's possible for the human body to survive without food for up to two months. Last year, a 56-year-old woman from British Columbia survived nearly 50 days in the Nevada wilderness on sweets and water after being stranded in the mountains while her husband went in search of help. In fact there're many causes that can influence a person's ability to survive, such as the way the body's metabolism slows down to keep energy. When the body stops getting food, it has to live on the stored sugars. When this runs out, fat is then turned into the second energy supply. After the fat runs out, the body must take recycled protein from the system and finally from the muscles. But this is very expensive fuel for the body. It's like being in a cold house and burning furniture instead of firewood. However, the muscle loss slows the body's work, causing it to burn calories at a slower rate. Being trapped into a small space would have helped Skyllberg keep precious calories. The car was covered in snow, creating what some experts have described as an "igloo effect" on the car. A person's mental state can play a key role in how long they survive, according to Stephen Joseph, a professor at the University of Nottingham. "In dangerous situations survival depends on personalities. Some might lose hope, while others are more hopeful." says Joseph. "Hope is probably a big key to this." Question: What may partly lead to Peter Skyllberg's survival of two months according to the text? - Enough food. - Fast metabolism. - Low temperature. - High spirits.
High spirits.

Read the following article and select the best answer. Article: Dogs and cats are not for students who live in the dormitory. Just think about the noise, the smell and all that wild behavior--chewing on whatever they can get their teeth on, or knocking over the trash can. But don't feel sad. There are smaller and less destructive pets to make your dormitory life colorful. Betta fish They make great pets with their big personality and astonishing colors, ranging from bright red, dark blue to lemon yellow. Unlike many fish, most bettas react to their owner's presence and become more active when they are nearby, which is unusual in the fish world. Chinchillas Without bad smell, about the size of a rabbit and with fur so dense that they can't get pests such as fleas , the friendly creature originally from the Andes Mountains in South America makes an ideal indoor pet. Chinchillas are very social animals, so if you only have one, you will become its family. In cold winter days, in a glance at this fury pet in a dorm will bring you a lot of warmth. Land hermit crabs In a society where owners are often asked "Are they tasty?", land hermit crabs are among the most unlucky animals commonly kept as pets. But they are easy to care for, inexpensive and fascinating to watch. And the fact that they don't cause any allergic reactions makes them perfect for college dormitories. Red-eared sliders If you're interested in a lifelong friend, a red-eared slider makes a wonderful pet. If well cared for, they can live for around 40 years. But there are a couple of things you should know. Red-eared can grow to an adult size of up to 30cm! So you may need a larger tank quickly. In addition, you will need to provide UV lighting, water heater, and a swimming area and a basking area. Housing a red eared slider is not easy. Question: The text is mainly to _ . - introduce the best way to keep pets - offer useful tips for choosing pets - inform students of lifestyle of pets - recommend some dormitory pets
recommend some dormitory pets

Read the following article and select the best answer. Article: Every year, thousands of young Europeans set off to explore their continent by train in the summertime. It is a necessary part of growing up and often the first time many Europeans travel without their parents. Now you too can share this adventure. There are so many places you can not afford to miss while travelling in Europe: the Eiffel Tower of France, windmills of the Netherlands and the Colosseum of Rome. How do young people afford to visit everything they want? The answer lies with the Eurail Pass. This ticket allows a traveller unlimited journeys by rail in European countries which are members of the scheme. Ambitious Chinese travellers can buy the ticket in Beijing, Shanghai and Guangzhou. The most popular type of Eurail Pass amongst young people, according to Zhao Jiaji, from China Air Service Ltd, is the Eurail Selectpasses. With this you can design your own trip by selecting three, four or five neighbouring countries from a total 18 nations including Liechtenstein, Monaco, Hungary and Romania. "There is plenty of choice with this pass: in total this range offers over 400 different combinations of countries to choose from!" said Zhao. The Eurail Selectpass gives 5 to 10 travel days within a 2-month period. For more flexibility there are the Eurail Passes which allow you to take trains in 17 countries on any day you like. It is valid for a period of either 15 or 21 days, one, two or three months. If you just want to travel in one or two countries to learn more about the local culture, Eurail Pass also offers two-country passes such as Spain-Portugal, France-Switzerland and Belgium-Luxemburg. And countries like Britain, France and Germany offer a kind of Eurail Pass which allows unlimited train travel in their country. Before buying the Eurail Pass, you should know some tips to save money. The 2nd class train travel ticket is cheaper than 1st class. And youths under 26 years old or groups of 2 or more people traveling together can enjoy discounts. For more information, please check out... Question: With the Eurail Selectpasses, you can _ . - stay in Europe for 2 months or even longer - enjoy a wide range of combinations of countries - take trains on any day you like - focus your trip in one or two countries
enjoy a wide range of combinations of countries