Read the following 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: This passage is mainly about_. - how a dentist can save a knocked-out tooth - how to keep a knocked-out tooth healthy - how Dr.Courts and other researchers made their experiments - how to put a knocked-out tooth back into its socket
how to keep a knocked-out tooth healthy

Read the following article and select the best answer. Article: Mrs. Goff is a math teacher at Lincoln High School. Mrs. Goff and I met my freshman year. Zach Howe and I were on our way to a baseball game when he said he needed to get his stuff from Mrs. Goff's room. I had no idea who she was then, but he said she was great. Well, he was definitely right. Last year, I had a college math class that required me to be in the computer lab, which was located directly behind Mrs. Goff's room. When I struggled in the section, I would go to Mrs. Goff's and ask for assistance. She told me that I was a little too dependent and not confident enough in my ability. A little confidence, combined with effort, will do wonders for anyone in anything. If you go into something thinking negative thoughts, negative things will happen. Mrs. Goff taught me that it was OK to make a few mistakes. Mistakes are a part of everyone's life. She told me that it is how you learn from them that defines your character. A person that learns from his or her mistakes is more likely to be a successful person in life. This year, I have spent a lot of time with Mrs. Goff. She really helps me instill confidence in myself and others around me. The encouragement that she has given me made me realize that I can do the same thing for people. Therefore, she has helped my leadership skills and increased my confidence in being outgoing. Mrs. Goff is a great role model in my life, and I appreciate everything she has done for me. I will never forget the things that she has done for me and the things she has helped me learn and accomplish throughout high school. I hope to be as good a teacher as she and give encouragement that she has for me and all of her students. Question: What can we conclude from the passage? - A little confidence may help you achieve what might be impossible. - Mrs. Goff is the best math teacher. - A teacher determines the fate of a student. - The author became successful due to Mrs. Goff.
A little confidence may help you achieve what might be impossible.

Q: Read the following article and select the best answer. Article: On the day after Thanskgiving in the US, or Black Friday, lots of stores offer special discounts to mark the beginning of holiday shopping season. In China, a similar day falls on Nov. 11 when millions of Chinese shoppers go to Tmall.com and Taobao.com, two e-commerce websites operated by Alibaba. The 11.11 Shopping Festival, as the event is now called, is also known in China as Singles Day. The shopping festival first started in 2009 and Alibaba said it chose the date because it was easy to remember. Last year, Tmall and Taobao together produced 19.1 billion in sales on that day, according to Alibaba. This year's shopping festival kicked off with an even stronger start--sales hit 100 million yuan 55 seconds after midnight and reached 35 billion at the end of the day. The shopping spree drew the attention of China's leaders, as Premier Li Keqiang recently praised Alibaba's founder, Jack Ma, for creating a day for consumption. China is trying to lead the country's economy to a slower, more sustainable growth model based on domestic consumption instead of investment and exports. Online shopping is no doubt a growth point that will release spending potential. China had 564 million regular Internet users by the end of last year. It has surpassed the US to become the world's largest e-commerce market, with its online sales over 1 trillion US dollars (6 trillion yuan) by 2020. "The real-time nature of online consumption attracts millions of people to spend money and enjoy life. E-commerce opens a new channel for China to encourage domestic demand," Liu Yin, vice-president of the China International Electronic Commerce Center said. More importantly, it promotes employment and the logistics industry with its sales model of "online purchasing plus express delivery", he added. Convenience, choice and low prices have increased online shopping, but there are still some problems with the one-day shopping spree. Some online shops, driven by the huge profits, took this opportunity to play price tricks. They raised... Question: In this year's 11.11 Shopping Festival, Tmall and Taobao produced _ in all. - 19.1 billion yuan - 100 million yuan - 35.1 billion yuan - 35 billion yuan
A: 35 billion yuan