Imagine having an idea, drawing it on paper, bringing it to a store and seeing it turned into a physical object.This is now possible with the help of 3D printers.Such machines were once used just by universities and big companies.But now, stores with 3D printing services are appearing around the United States. Bryan Jaycox and his wife opened The Build Shop LLC in Los Angeles two years ago.The store is filled with tools like a laser cutter, an industrial sewing machine and 3D printers.Bryan Jaycox requires $ 15 an hour to print an object.He also charges a fee depending on the size of the object and up to $ 50 an hour for design and labor services. The Jaycoxs also offer 3D printing classes for anyone who is interested.One of the students in a recent class was Ki Chong Tran.He plans to open a 3D printing business in Cambodia."The demand has been amazing.It's been much more than I would have imagined," said Ki Chong Tran. "I think 3D printing is going to be huge. It's going to make a huge impact on society as a whole," he added. Mr Jaycox predicts that within five years, 3D printing technology could become more consumer friendly. But Ki Chong Tran says even current technology can make a difference in a developing country like Cambodia."With 3D printing you can give them tools, and you put it in their hands so they are responsible more for their own development. They learn skills beyond just learning English and becoming a tour guide or something like that or working at a bank.You can actually create things that give value to the world," said Ki Chong Tran. He says it's not just Cambodia but anywhere where there is a 3D printer, it can turn a good idea into reality. How will 3D printing technology benefit developing countries according to the text? A) It helps the people work efficiently at a bank. B) It will promote the learning of English C) It will accelerate the development of tourism. D) It offers them a new way of development.
D

Zero gravity looks cool. But what about the thing no one likes to talk about? Yes, that is right: going to bathroom. Zero gravity makes this everyday task quite a challenge. Astronauts have to be toilet-trained all over again. The Apollo astronauts raised themselves off the seat of their chairs and stuck a clear plastic bag to their back sides with sticky strips. A second astronaut watched closely to be sure no waste matter escaped the seal. (You would not want that stuff floating around the cabin!) When the deed was done, the astronaut cleaned up with a piece of plastic attached to the inside of the bag, removed the bag, dropped a disinfectant pill in with the waste matter, and put the whole thing, sealed, into a special container. Donald W. Rethke, an engineer for Hamilton Standard Space Systems, developed a more private way to answer nature's call: the space toilet. It is somewhat like the kind of toilet one would find on commercial airplanes --- with unique adaptations for zero gravity, of course. For instance, it has thigh bars that keep the astronaut from floating off the seat. The astronaut (male or female) defecates in a bag and urinates in a hose. Solid and liquid wastes are kept separated because at least 85% of the urine is recycled and, yes, after careful filtration, used for drinking and other purposes. (Water is always in demand in space.) A vacuum sucks the waste materials into the toilet, where the waste is compacted into hamburger-like patties for easy storage. Although not exactly like an earthbound visit to the toilet, it is at the very least much more private than in the early days of space travel. To ensure the user remains seated, the toilet comes equipped with _ A) a plastic bag B) a sticky strip C) a wide hose D) a thigh bar
D

Welcome to Pocono Whitewater There's something fun here at Pocono Whitewater for every level of adventurer! We have mild to wild whitewater rafting , family trips, and birdwatching boating. Choose one adventure now. It's up to you! We have trips available daily. Give us a call today! Dam Release Whitewater Rafting Experience the best whitewater on the Lehigh River! Surrounded by forests and mountains, you will enjoy 12 miles and 5 hours of Class III whitewater rafting and outstanding scenery. This is a fun and thrilling trip that everyone over the age of 12 can make. While paddling in the swift water, you'll shout and laugh. Dam Release Whitewater Rafting Rates: Individual (over the age of 12) : $61.00 Group (at least 8 persons) : $31.00 Rates Include: all necessary rafting equipment, life jackets, free parking, bus service to/from the river and professional river guides. Family Style Whitewater Rafting Bring along the whole family this summer and enjoy 8 miles and 5 hours of Class I whitewater rafting. Mild water of the Lehigh River is simply perfect for beginners, school groups, and kids aged 4 and older. This is just perfect for enjoying the passing scenery, kicking your feet over the edge of the raft, or taking a swim in the river! One of the most unique things about this trip is a free riverside barbeque ! Our workers will cook and serve you a picnic lunch -- hotdogs, potato salad, fruit, etc. The classic family picnic! Family Style Whitewater Rafting Rates: Adult: $39.00 Child (aged 4--14) : $33.00 Group (at least 8 persons) : $30.00 Rates Include: all necessary rafting equipment, life jackets, free parking, bus service to/from the river, and a barbeque lunch, river guides not included. We can infer that _ . A) the higher the class is, the milder the water is B) the lower the class is, the milder the water is C) the higher the class is, the safer the rafting is D) the lower the class is, the faster the rafting is
B

Macao, also called Macau, is on the western side of the Pearl River entrance, at the head of which is the Chinese port of Guangdong and it stands opposite Hong Kong which is on the eastern side of the entrance. It is made of a small narrow peninsula sticking out from Guangdong province. The total area of Macao is about 21.45 square kilometers, and it is made up of three parts: Macao Peninsula, Dingbat Isle and Lehman Isle. Between Macao Peninsula and Dingbat Isle there are two bridges which join the two parts together, and there is also a highway between the Dingbat and Lehman Isles. Therefore, two bridges and one highway make the three parts of Macao into an integrated region . Macao faces to the vast sea and its back is the Pearl River Delta. The two big cities, Hong Kong and Guangzhou, and the two special economic zones Hula and Shenzhen are its neighbors. All of this offers much advantage for its economic development. Macao has a population of about 450, 000. This is very large against the size of the area. The average population density reaches 20, 000 per square kilometer. It is one of the densest population regions in the world. The majority of its people are Chinese, who make up 96% of the whole population. In Macao there are only about _ people who are not Chinese. A) 18,000 B) 20,000 C) 21,450 D) 428,000
A