Read the article and select the best answer. Article: What do you do if you are hit in the mouth and one of your teeth is knocked out? A dentist may be able to put the tooth back in for you, but you have to get to the dentist first.In the meantime, you have to store the tooth so that it will stay healthy. The simplest thing to do is put the tooth back into your mouth, or you could put it in milk.Frank Courts, a dentist at the University of Florida, worked with other researchers to find the safest way of keeping knocked-out teeth.He tried putting teeth into milk, into water, and into cell-culture medium .He also tried, just drying the teeth in the open air.He used teeth that had to be removed from people's mouths for various reasons.The teeth were put into one of the solutions or stored in the air for one hour.Then cells from the root of the teeth were scraped-off the teeth.Dr.Courts and the others then studied how healthy these cells were. The cell-culture medium worked best to keep a knocked-out tooth healthy outside the mouth.However, few people keep cell-culture medium handy at home or in school. The next best thing was milk.But Dr.Courts said that the best thing of all was to wash the tooth and put it right back into its socket in the mouth.For some people, though, this is just too painful or upsetting.So milk will do, until you get your tooth (and your mouth)to a dentist. Question: Milk can be used instead of cell-culture medium to put a knocked-out tooth in because . Options: A: milk works better to keep the tooth healthy B: milk causes less pain C: cell-culture medium is not usually handy D: cell-culture medium is more expensive
C

Read the article and select the best answer. Article: You've just come home, after living abroad away, has this country changed for the better-or for a few years.Since you've been for the worse? If you've just arrived back inthe UK after a fortnights holiday, small changes have probably surprised you-anything from a Iocal grcengrocer suddenly being replaced by a mobile-phone shop to someone in your street moving house. So how have things changed to people coming back to Britain after seven, ten or even 15 year:' living abroad ? What changes in society can they see that the rest of us have hardly noticed ----or now take for granted ? To find out, we asked some people who recently returned. Dcbi: When we IcCheltenham, my home town, was a town of white ,middle-class families-all very conservative .The town is now home to many eastern Europeans and lots of Australians, who come here mainly to work in hotel and tourism.There are even severai snops only for foreigners. Having been an inunigrant myself, I admire people who go overseas to find a job.Maybe if I lived in an inner city where unemployment was high, I'd think differently, but I believe foreign settlers have improved this country because they're more open-minded and often work harder than the natives. Christine: As we flew home over Britain, both of us remarked how green everything looked.But the differences between the place we'd left behind and the one we returned to were brought sharply into focus as soon as we landed. To see policemen with guns in the airport for the first time was frightening-in Cyprus, they're very relaxed-and I got pulled over by customs officers just for taking a woolen sweater with some metal-made buttons out of my case in the arrivals hall.Everyone seemed to be on guard.Even the airport car-hire firm wanted a credit card rather than cash because they said their vehicles had been used by bank robbers. But anyway, this is still a green, beautiful country.I just wish more people would appreciate w,that they've got. Question: Which might be the best title for the passage? Options: A: Life in Britain. B: Back in Britain. C: Britain in Future. D: Britain in Memory.
B

Q: Read the article and select the best answer. Article: On behalf of the Electric Reliability Council of Texas (ERCOT), I would like to take this opportunity to thank you for conserving electricity during this period of continuous hot, dry weather in Texas. At ERCOT, we have been working around the clock to keep the electricity flowing, making sure you have the resources you need to stay productive and well this summer. While we are always charged with making sure you have adequate electricity, this summer has caused a particularly serious challenge to the electric grid . Because the heat has been sustained over the entire state with little or no rain or cloud cover, the strain on the electric grid has been greater than ever before. In Dallas and Austin, we are beating all-time records for triple-digit heat. We have hit three all-time demand peaks in the last two weeks alone, meaning we've used more electricity on three days this summer than on any other day in the history of ERCOT, which covers most of Texas. Additionally, Texas is experiencing economic and population growth while much of the rest of the country is not. All of these factors are contributing to very high energy usage this summer. As you probably read in your newspaper or saw on the news, ERCOT has issued appeals for conservation across the state this August. We have encouraged businesses and residential customers to help us save electricity between the critical hours of 3 and 7 p.m. For instance, turning off unnecessary lights, appliances and electronic equipment can help conditions significantly. Conservation efforts help us avoid statewide rotating outages and keep your lights on and air-conditioners running. Conservation not only keeps power and cool air flowing to every citizen, it ensures that uninterrupted power flows to critical care customers, who are easily harmed in the extreme heat. While ERCOT has not called for rotating outages this summer, it is important to remember that we only carry out these orderly, temporary outages to prevent a catastrophic collapse of the electric grid. As... Question: We can know from the passage that _ . Options: A: a grid failure occurred in the Northeast several years ago B: the residents of Texas don't like hot, dry weather C: more electricity has been consumed this summer than in any other summer D: it takes weeks for the grid to return to normal once it fails
A: A

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Read the article and select the best answer. Article: Does school start too early? Judging from the teenagers who yawn in class, it does. And those students aren't just lazy. Scientific studies have shown that school does start too early for young students. According to a series of studies done across the U.S., the later classes begin, the more academic performance improves. Boys and girls naturally stay up later and sleep in later. The trend begins around age 13 or 14 and peaks between 17 and 19.The teens also need more sleep in general, so forcing them to be up early for school cuts into their sleep time as well as their sleep rhythm, making them less ready to learn during those first-period classes. Practice is proving the science. Hundreds of school districts in the U.S. have experimented with later start times and the academic performance of students has improved as a result. A study of 9,000 high school students in three states showed that grades in science, math, English and social studies all rose when school began at 8:35 or later. What's more, attendance goes up and student depression goes down. The later school starts, the better the result, too. According to a study, delaying the opening bell from 7:30 a.m. to 8:30 a.m. paid off more than delaying only until 8:00 a.m. Students who get at least eight hours of sleep, and preferably nine, perform better than those who do not, so a greater delay raises the chances of achieving those numbers. So, it turns out morning class is just too early for students to learn chemistry equations or study an ancient poem. If you cannot change the school schedule, adjusting your own timetable to ensure eight hours' sleep can also help you perform better at school. Question: It is implied in the passage that in the morning _ . Options: A: there should be no classes B: students' sleep should be guaranteed C: there should be Chinese lessons D: there should be no science lessons
(Answer)
D