The vast jungles of the Amazon rainforest are home to tribes   mostly isolated from the outside world, whose way of life, largely unchanged for hundreds of years, is now increasingly threatened by modern civilization. Now, scientists discover they can monitor these "uncontacted tribes" using satellites, which would allow inexpensive and safe tracking of these tribes in order to protect them from outside threats. In order to help preserve these uncontacted Indians, researchers need accurate estimates of their populations. One way to collect this data involves flying over their villages, but such over-flights are both expensive and could fill these native peoples with fear. Another strategy involves meeting individuals on the ground, but among other risks, scientists could accidentally spread disease to members of the tribes. Instead, scientists investigated whether satellite images could monitor uncontacted tribes. The result was inspiring. They confirmed their locations and measured the sizes of their village, houses and gardens. "We can find isolated villages with remote sensing and study them over time." Walker told Live Science. "We can ask: Are they growing? Do they move?" Surprisingly, based on the sizes of the houses and villages, the scientists find the population densities of these isolated villages are about 10 times greater, on average, than other villages of native Brazilian peoples. This may be due to the fact that they have to live closer together because they are not as good at clearing the forest, since they lack modern devices like chainsaws and tractors, the researchers said. The tribes may also be afraid of spreading out due to fear of being attacked by outsiders, Walker said. The researchers now plan to focus on 29 more isolated villages to "look at their ecology-- that is, distance from rivers and roads--and use this to model where else we can find more isolated villages," Walker said. Scientists don't want to meet the Indians on the ground due to the fear that   _  . A) they can't get accurate data B) they could pass disease to the Indians C) they will be attacked by the Indians D) they will catch disease from the Indians
B


(Question)
Did you ever wonder how some of your favorite foods, products or toys came about? Believe it or not, they may have been an accident, or a failure of some other intention. Below, we found three mistakes we're thankful for turned out to be what they are. 1. Most historians hold that the Chinese invented fireworks in the 9th century when they discovered how to make gunpowder. Story has it that a Chinese cook accidentally mixed together what were then considered common kitchen items and noticed they burnt. When put tightly in a bamboo tube and lit, it blew up. 2. In May of 1886, a law led John Pemberton, a pharmacist , to rewrite the formula  for "Pemberton's French Wine Coca," his popular headache treatment. Containing sugar instead of wine as a sweetener, the outcome became something for Coke, which was later mixed with carbonated water. His bookkeeper suggested the name Coca-Cola because he thought the two C's would look good together, which is how what we call Coca-Cola, a world -wide drink came into being. 3. During World War II, scientists at the University of Birmingham invented the magnetron--an important heat-producing part of the microwave oven . While working for Raytheon Corporation after the war, the American engineer Percy Spencer was testing the magnetron when a chocolate bar in his pocket melted. He went on to test other foods including popcorn kernels, and found it to be a much more efficient way to cook. In 1947 Raytheon came out with the first restaurant microwave oven, which was six feet tall and weighed 750 lbs. What can we learn from the above invention stories? A) Experiments make great inventors of our time. B) Nothing is impossible if one tries each day. C) Inventors come out of hard work at any time. D) A small incident may lead to a great invention.
(Answer)
D


Ques: Visit one of the most outstanding prehistoric sites in the United Kingdom, and enjoy amazing historic English attractions. Please notice that every tour starts and ends in London. Have a tour with Visiting Britain. Stonehenge Direct Tour Visit one of the most outstanding prehistoric sites in England and in the world: Stonehenge. Duration: 1 day Price: Adults PS29.99, Children PS28.99 Stonehenge and Bath Tour Enjoy a late breakfast before heading to the Stonehenge site and end your day with an original visit of the Roman Baths. Duration: 10 hours (departure 10:30 am return 8:30 pm). Price: Adults PS64, Children PS60 Stonehenge, Bath and Windsor Castle Tour Explore three of England's most popular sites to visit: Windsor Castle, Stonehenge and the Roman Baths. Duration: 1 day (return 8:30 pm) Price: Adults PS64.80, Children PS61.20 Stonehenge, Lacock and Bath Tour Come and feel the warmth of Bath, see the pleasant village of Lacock, and solve the mystery of Stonehenge. Duration: 1 day (return 6 pm) Price: Adults PS85, Children PS78 Stonehenge, Windsor and Oxford Tour Choose Stonehenge, Windsor and Oxford Tour and enjoy ancient mysticism, royal history and illustrious knowledge. Duration: 1 day Price: Adults PS72, Children PS68 Stonehenge, Bath and Stratford Tour Take a tour to make the most of the English historic attractions: the Stonehenge site, Bath and Stratford, the birthplace of playwright William Shakespeare. Duration: 1 day (return 8 pm) Price: Adults PS79, Children PS68 Two 15-year-old foreign students who want to visit Stonehenge and Oxford University will have to pay at least   _  . A) PS136 B) PS170 C) PS110 D) PS126
Ans: A


Ques: Speak confidently and think logically. Year 13 schoolboy Arunabh Prakash can't agree more. Anmabh is one of the five students that will represent New Zealand at the 26th World Schools Debating Championships (WSDC) to be held in Thailand from August 5 to l5 this year. "You've got to be persuasive, regardless of the fact that you believe in a topic or not," says the 17-year-old. "There are a lot of speakers who are eloquent   but find it difficult to think logically and then there are those who have a good argument but can't deliver." Endurance   is another quality he says one must have in the heated arena   of expressing opinions and ideas. "There are times when you have to debate for five hours at a go and are completely exhausted. It's quite intense. You must have the energy to debate for long hours," says Arunabh, who began debating in year 10. The WSDC is a debating competition in the world for high school students from different countries. It involves four prepared debates and four impromptu debates -- debates without specific preparations. To gain selection for the national team for the global final, Arunabh had to compete with regional teams. Despite the mounting pressure, he says he was confident of winning. "We didn't loose a debate in the first two days. And we had a very strong team. We were confident of our ability to win," he says. What can we know about Arunabh from the text? A) He started debating at the age of ten. B) He is on his country's national debating team. C) He argues only on the topics that he believes in. D) He is unsure of winning the debating competition.
Ans:
B