Question: Three kids have been learning chemistry for only a few months. But they have already begun to challenge a world famous scientist! Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator . They want it to take the place of litmus paper. "We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other." British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world. But when the kids did some experiments in class last winter, they saw that the litmus paper didn't turn very blue with base matter. It's hard to get a clear result. Will there be a better indicator than litmus paper? The three kids decided to try and find out! How? They went to collect over 40 plants in parks, gardens and markets. Then they ground leaves, flowers and stems to get the pigments from them. The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper! "It's our first scientific journey, Huang said, "But it makes me want to try harder." The story mainly tells us _ . A) how to make litmus paper B) about the three kids' spirit C) scientists were wrong D) the kids are heroes
Answer: B

Question: When US student Olivia Priedeman, 17, woke up one morning, she thought she had had a dream about making plans with a friend. But it wasn't a dream. Her phone showed that during the night, Priedeman had read a text message from her friend. She did it while she was fast asleep. Reading and sending text messages while asleep--called "sleep texting"--is an unusual sleep behaviour, similar to sleepwalking. It's also a growing concern among doctors: young people can't live without their cell phones. One in three teenagers sends more than 100 text messages a day, according to the Pew Internet & American Life Project. And at least four out of five teenagers said they sleep with their phone on or near their bed. Elizabeth Dowdell, a professor at Villanova University in Pennsylvania, has studied sleeping texting. She said that having a phone nearby all night is a big part of the problem. Andrew Stiehm, a sleep medicine expert with Allina Health in Minnesota, agrees. It's possible for the part of the brain that controls motor skills to wake up, while the part of the brain that controls memory and judgment may be still asleep. That's why some people can perform basic movements ---such as walking, talking, texting or even driving--while they're sleeping. Some of Dowdell's students said that they're disturbed by their nighttime texting behavior. But because sleep texting is _ , it's a difficult habit to break. Dowdell said she knows of some students who wear socks on their hands to keep themselves from texting. Marjorie Hogan, a doctor at Hennepin County Medical Center in Minneapolis, Minnesota, suggests keeping all electronic devices outside the bedroom at certain times. What does doctor Hogan suggest people who sleep text do? A) Stop text during the daytime. B) Take some medicine to control the behaviour. C) Keep their phones out of their bedrooms while they sleep. D) Wear socks on their hands to stop themselves from texting.
Answer: C

Question: Hello! I'm an English girl.My first name is Lucy.My last name is White.I'm in No.3 Middle School.My father and mother are in No.3 Middle School, too.They are English teachers.My brother is in Nanchang University .His name is Tony.I have a Chinese teacher.Her name is Wang Yan.She can speak English well.She is a good teacher. Tony is _ . A) my father B) my mother C) my Chinese teacher D) my brother
Answer:
D