question: Children can spend hours a day looking at computer screens and other digital devices . Some eye doctors say this leads to an increase in "computer vision syndrome ." Nathan Bonilla-Warford is an optometrist in Tampa, Florida. He has seen an increase in problems in children. "A lot more children come into the office either because their parents have noticed that they have headaches or red or watery eyes or discomfort, or because their nearsightedness appears to be increasing and they're worried," he says. Dr. Bonilla-Warford says part of the problem is that children may be more likely to pay no attention to early warning signs than adults. "Even if their eyes start to feel uncomfortable or they start to get a headache, they're less likely to tell their parents, because they don't want to have the game or the computer or whatever taken away," he explains. He says another part of the problem is that people blink less often when they use digital devices. He says, "A person who uses an electronic device blinks about one third as much as we normally do in everyday life. And so that can result in the front part of the eye drying and not staying protected like normal." Eye doctors offer suggestions like following which is known as the 20/20/20 rule. That means every twenty minutes look away twenty feet or more for at least twenty seconds from whatever device you're using. Other suggestions include putting more distance between you and the device and using good lighting. Of course, another way is to spend less time looking at screens. Many experts say children should spend no more than two hours a day using digital devices--with no screen time for children under two. But not all eye doctors have noticed an increase in problems in children. Dr. David Hunter, from Children's Hospital Boston, has not seen an increase in his practice. "While it is possible to develop _ looking at screens for a long period of time, there's certainly no proof that it actually causes any damage to the eyes." he says.
1. Who is in Tampa?
2. Is he a dentist there?
****
answer: 1. Nathan Bonilla-Warford
2. yes

Mandarin is a group of related varieties of Chinese spoken across most of northern and southwestern China. The group includes the Beijing dialect, the basis of Standard Mandarin or Standard Chinese. Because most Mandarin dialects are found in the north, the group is sometimes referred to as the Northern dialects (). Many local Mandarin varieties are not mutually intelligible. Nevertheless, Mandarin is often placed first in lists of languages by number of native speakers (with nearly a billion).

Mandarin is by far the largest of the seven or ten Chinese dialect groups, with 70 percent of Chinese speakers and a huge area stretching from Yunnan in the southwest to Xinjiang in the northwest and Heilongjiang in the northeast. This is attributed to the greater ease of travel and communication in the North China Plain compared to the more mountainous south, combined with the relatively recent spread of Mandarin to frontier areas.

Most Mandarin varieties have four tones. The final stops of Middle Chinese have disappeared in most of these varieties, but some have merged them as a final glottal stop. Many Mandarin varieties, including the Beijing dialect, retain retroflex initial consonants, which have been lost in southern dialect groups.

The capital has been within the Mandarin area for most of the last millennium, making these dialects very influential. Some form of Mandarin has served as a national lingua franca since the 14th century. In the early 20th century, a standard form based on the Beijing dialect, with elements from other Mandarin dialects, was adopted as the national language. Standard Chinese is the official language of the People's Republic of China and Taiwan and one of the four official languages of Singapore. It is used as one of the working languages of the United Nations. It is also one of the most frequently used varieties of Chinese among Chinese diaspora communities internationally. What are the answers to this following set of questions: 1. what is mandrin
2. does the group include bejing dialect
3. how large is it
4. how many tones is it
5. what language was adopted as national language
6. what is official language of China
7. how many chinese dialects are there
8. all they all intelligable
9. how long has capital been within the mandrin
10. how many native speakers
Answer: 1. a group of related varieties of Chinese
2. Yes
3. by far the largest of the seven or ten Chinese dialect groups
4. Most Mandarin varieties have four tones
5. Mandarin
6. Standard Chinese
7. seven or ten
8. No
9. most of the last millennium
10. unknown

input: Make use of the article to answer the questions. Electronic books have changed the way many people read for pleasure. Now online textbooks are changing the way some students learn and some teachers teach.

More than one hundred seventy-five thousand students attend the public schools in Fairfax County, Virginia, outside Washington. Last year, the school system used digital books in fifteen schools. This school year, middle schools and high schools changed from printed to electronic textbooks in their social studies classes.

Luke Rosa is a history teacher at Falls Church High School. His students work on laptop computers at school. He explains the idea to them this way. "I mean, it's just like a regular textbook, except it's got it all online."

Peter Noonan, an assistant superintendent of schools, said, "The world's changing. And the online textbooks can change right along with the events that are happening." Digital books also cost less than printed textbooks, he said.

A student named Melanie Reuter said, "I don't have to carry a textbook around, so that's nice."

But another student said, "I don't like it because the Internet sometimes doesn't work."

Students also need access to the Internet when they are not at school. About ten percent of students in Fairfax Country do not have a computer or online access at home. Public libraries in the country have free Internet. There are also after-school computer labs as well as computer clubhouse supported by the country. Middle school student Slieman Hakim is happy about that. He said, "My family only has one computer; my sister and I both do our homework on it. So I come here to do my homework. It's good."

Other school systems in the area are also considering online textbooks. 1. What is having an impact on education?
2. How does Melanie feel about them?
3. Why?
4. Does anyone mention a downside?
5. What is it?
6. Who teaches history?
7. Where?
8. What does the superintendant like about them?
9. Can they be updated more easily?
10. How many kids attend school in Fairfax county?
11. What state is it located in?
12. How many schools had digital text books last year?
13. Is anyone getting them this year?
14. Who?
15. For all courses?
16. Which one?
17. Do people use them for reading other things?
18. Is the school located in Washington?
19. Is it near there?
20. Who has students who work on computers in class?
numbered_answers:
1. Now online textbooks
2. She likes it
3. She doesn't have to carry a textbook around
4. Yes
5. because the Internet sometimes doesn't work
6. Luke Rosa
7. Falls Church High School
8. Digital books also cost less than printed textbooks
9. Yes
10. one hundred seventy-five thousand
11. Virginia
12. fifteen
13. Yes
14. middle schools and high schools
15. No
16. social studies
17. Yes
18. No
19. Yes
20. Luke Rosa