Read the article and select the best answer. Article: Large areas of the Amazon rainforest were grassland until just 2,000 years ago when it has been found. Researchers say the find gives new light on the Amazon's history - and show it was a savannah rather than the high forest it is today. They believe much of the area was grassland until a natural shift to a wetter climate about 2,000 years ago let the rainforests form, according to a study that challenges common belief that the world's biggest tropical forest is far older. The arrival of European diseases after Columbus crossed the Atlantic in 1492 may also have sped up the growth of forests by killing the local people farming the region, the scientists wrote in the US journal Proceedings of the National Academy of Sciences (PNAS). "The dominant ecosystem was more like a savannah than the rainforest we see today," John Carson, lead author at the University of Reading in England, said of the findings about the southern Amazon. The scientists said that a shift toward wetter conditions, perhaps caused by natural shifts in the Earth's orbit around the sun, led to growth of more trees starting about 2,000 years ago. The "findings suggest that rather than being rainforest hunter-gatherers, or large-scale forest clearers, the people of the Amazon from 2,500 to 500 years ago were farmers," the University of Reading said in a statement. Carson said that perhaps a fifth of the Amazon basin, in the south, may have been savannah until the shift, with forests covering the rest. In one lake, Laguna Granja, rainforest plants only took over from grass as the main sources of sediments about 500 years old, suggesting a link to the arrival of Europeans. And understanding the forest could help solve puzzles about climate change. The Amazon rainforest affects climate change because trees soak up heat-trapping carbon dioxide as they grow and release it when they rot or are burnt. Brazil has sharply slowed deforestation rates in recent years. Question: In what way does the study challenge people's traditional belief? Options: A: Understanding of climate change. B: History of the Amazon rainforests. C: Time of the arrival of Europeans. D: Shifts in the earth's orbit around the sun.
B

(Question)
Read the article and select the best answer. Article: Canada is a very large country. It is the second largest country in the world .By contrast it has a very small population. There are only about 29 million people there. Most Canadians are of British or French origin, and French is an official language of Canada as well as English .About 45%of the people are of British origin, that is, they or their parents or grandparents, etc, come from British. Nearly 30%are of French origin. Most of the French-Canadians live in province of Quebec. Over the years, people have come to live in Canada from many countries in the world .They are from many countries in the world .They are from most European countries and also from China, besides other Asian countries. However, Canada was not an empty country when the Europeans began to arrive. Canadian Indians lived along the coast, by the rivers and lakes and in forests. Today, there are only about 350,000 Indians in the whole country, with their own languages. In the far north live the Inuit There are only 27,000 Canadian-Inuit. Their life is hard in such a difficult climate. Question: Which of the following is true according to this passage? Options: A: There are 27,000 Canadian-Indians in Canada. B: More than 13 million people have come from Britain and France recent years. C: There are 30% of the population whose parents or grandparents come from France. D: There are no people when the Europeans began to arrive in Canada.
(Answer)
C

Ques: Read the article and select the best answer. Article: On January 11, 2007, as students sat and listened, a very important guest speaker named Richard, spoke to the students in the lecture hall. He not only showed the potential within young adults, but encouraged them to work hard at their lessons. Richard was a young child when his mother died and his father walked out. He was forced into many different foster homes where he felt unhappy. He did not know that his life was taking a turn for the worst. His uncle, after getting out of prison, got him into drugs and alcohol. His uncle taught him that his place in life was either to be in prison or die trying to be "a man." His uncle's teaching almost started affecting him until a very important person came into his life: a teacher. This teacher taught him there is a place in the world for everyone and it isn't related to drugs. Richard is now a Harvard University graduate and has a great and loving family. Why? He was taught to have respect not only for others, but for himself. After the meeting, it was hoped that the students realized within them there is a potential, and within everyone around them, is knowledge. As Richard reminded them, "Knowledge is power." Question: When he was young, Richard lived a(an) _ life in foster homes. Options: A: rich B: unhappy C: relaxing D: interesting
Ans: B

Ques: Read the article and select the best answer. Article: The green turtle is listed as endangered by the International Union for the Conservation of Nature. Under the U.S. Endangered Species Act of 1973, the green turtle was listed as threatened except for the breeding populations in Florida and on the Pacific coast of Mexico, where it is listed as endangered. Green turtles continue to be caught for money by humans, and the destruction and loss of nesting and foraging sites is a serious problem. Humans have already caused the decrease of large green turtle populations, including those that once nested in Bermuda and Cayman Islands. The situation of green turtle populations is difficult to determine because of our lack of knowledge about their life cycles. The number of nests in Florida appears to be increasing, but we don't know whether this is due to an increase in the number of nests or because we have started to monitor nesting beaches more closely. The green turtle is the largest hardshelled sea turtle. Adults of this species commonly reach 100 cm in length and 150 kg in mass. The average size of a female nesting in Florida is 101.5 cm straight in length, with an average body mass of 136 kg. Growth rates of green turtles have not been measured under natural conditions. Green turtles grow slowly. In the southern Bahamas, green turtles grow from 30 to 75 cm in 17 years, and according to Bjorndal and Bolten, growth rates decrease with increasing length. Growth rates measured in green turtles from Florida and Puerto Rico fall within the range of growth rates measured in the southern Bahamas. Based on growth rate studies of wild green turtles, the researchers Balazs, Frazer and Ehrhart estimate the age of sexual maturity can range anywhere from 20 to 50 years. Question: Why is it hard for us to know the number of green turtles? Options: A: Because it is difficult for us to be close to them. B: Because we have limited knowledge about them. C: Because we haven't measured their growth rates. D: Because they grow too slowly.
Ans:
B