Read the following article and select the best answer. Article: If you're like most kids, you've probably made more than a few paper airplanes in your day. But how many kids can say their paper airplanes have been built life-size and then flown? At least one: 12-year-old Arturo Veldenegro of Tucson, Arizona, who won the Pima Air& Space Museum's first annual Great Paper Airplane Project Fly-Off in March 2012. " The purpose of the competition is to inspire and draw kids' interest in science and flight," says Tim Vimmerstedt, director of the museum. About 150 kids entered the competition. The young designers learned about how airplanes fly and then set to work designing their own planes. Arturo designed and built his airplane. When hen was finished, he took his plane to the flight area and let it fly, outdistancing the other competitors in all age groups. At last, Arturo's airplane flew the farthest---more than 75 feet! As the winner, Arturo got to meet with a team of engineers, which took his design and made a bigger one. The new paper airplane might have been the largest one ever built! Arturo named his large paper airplane Arturo's Desert Eagle. Later a helicopter tried to lift the paper airplane over the Arizona desert, but it was unsuccessful. Engineers worked for eight hours to repair it for a second try. This time, the helicopter managed to raise it to 2700 feet and then set the plane free. Arturo watched as his plane flew through the sky at speeds of up to 98 miles per hour for 10 seconds before falling to pieces. "I felt happy but sad," Arturo says, " It flew really well, but it was sad to see it destroyed." But that wasn't the end of Arturo's Desert Eagle. The Pima Air & Space Museum collected the pieces of the broken plane and put them on show to inspire other young engineers to reach for the sky. Question: What do we know about the paper airplane Arturo built? - It flew the highest - It flew for 20 minutes - It flew more than 75 feet - it took him eight hours to build
It flew more than 75 feet

Read the following article and select the best answer. Article: Elephants might be the most well-known and well-loved animal in African wildlife. But conservation of the African elephant faces special difficulties. While the elephant population is half of what it was 40 years ago, some areas of Africa have more elephants than populated areas can support. That's why AWF scientists are studying elephant behavior, protecting habitats and finding ways for humans to live peacefully with elephants in Africa. Years ago, over hunting and the ivory trade were the biggest threats to elephants survival. Luckily, ivory bans , hunting rules and protected areas protect elephants from these dangers today. The 21st century brings a different challenge to elephant conservation --land-use. Elephants walk across borders and outside parks and other protected areas. So they often destroy crops, causing conflicts between local farmers and these big animals. Successful conservation strategies must allow elephants to walk freely in their natural habitats while reducing conflicts between elephants and local people. AWF researchers are searching for a way to give both elephants and people the space they need. The AWF is collecting information on elephant habitats and behavior. The information they gather will help to develop the widest possible space for elephants. The AWF is helping elephants by protecting their habitats. And they also work with local farmers to improve their life in order to encourage them to protect rather than destroy elephants. Question: What is the biggest difficulty in protecting African elephants now? - They are still being killed. - Their habitats are being destroyed. - They don't have enough food. - They can't live in peace with farmers.
They can't live in peace with farmers.

Read the following article and select the best answer. Article: Life in space will certainly take some getting used to!But the space station has been designed to keep the astronauts as comfortable as possible--the modules are roomy,bright,and kept at a constant 70 degrees Fahrenheit.It's important the crew members are comfortable because they'll be busy aboard the station.In a typical workday,crew members will spend 14 hours working and exercising,1.5 hours preparing and eating meals,and 8.5 hours sleeping.Here are some other fun facts about life aboard the station: Food Come mealtime,astronauts will have a special dining kitchen.Space food just keeps getting better--and more like food we enjoy here on Earth.In early space missions,astronauts could eat only freezedried food that didn't require any preparation.But the space station is equipped with water,microwave ovens,and refrigerators,allowing the folks on board to eat more "normal" types of food,including fruit,vegetables,and ice cream! Sleep Each crew member has a private room.With no gravity,they'll need to tie themselves to their beds,or they will float away!That might sound like a strange way to sleep,but astronauts from past space missions report that sleeping in space is actually pretty great! Exercise You might not think it,but exercise is even more important on the station than it is on Earth.There is not much gravity in space.Astronauts don't stand up,sit down or walk in space,so their muscles and bones don't have to work much--and this muscle and bone loss can be dangerous back on Earth.To fight this,astronauts on the station will exercise on bikes,rowing machines,and other equipment about two hours every day. Clothing Astronauts will have to wear special space suits while traveling aboard the U.S.shuttle or Russian rockets.But once they're safe inside the space station,crew members can wear regular clothing.Of course,a specially designed,pressurized space suit is required for space walks.It has to withstand flying pieces and protect the astronauts from dramatic temperature changes.It can range from 120... Question: Why is exercise more important in space than on earth? - It can make astronauts feel relaxed in space. - It can help astronauts spend their spare time happily. - Astronauts' lives are more important in space than on earth. - It can prevent astronauts from causing muscle and bone loss.
It can prevent astronauts from causing muscle and bone loss.