Scientists know of more than 1,000 volcanoes on the surface of Venus, Earth's "sister" planet. A big question has been: Are they still active? The scientists say yes. Their evidence for recent volcanic activity on Venus comes from a lava flow in the planet's northern hemisphere. The flow is hotter than the rocks around, which means the lava might still be cooling off. "The flow we studied seems to be very young---it is still warm inside," Nataliya Bondarenko said. Venus is a difficult planet to study from Earth because it is surrounded by thick clouds. Telescopes on Earth can't see through these clouds, so the best information about Venus comes from spacecraft orbiting it. Bondarenko and her colleagues studied the lava flow using data from NASA's Magellan mission. That spacecraft spent four years in orbit around Venus and used radar to make a map of 98 percent of the planet's surface. On October 11th, 1994, the mission ended, and the spacecraft plunged through Venus' heavy cloud cover and crashed onto the planet below. While in orbit, the Magellan craft sent microwaves, which can go through Venus' clouds, to the surface. Microwaves are invisible and can be as long as three feet. These waves are a kind of energy, like light. And like light, they bounce off surfaces. The way the waves bounced off the Venus' surface and back to the craft supplied information that the scientists used to estimate the temperature of various parts of the planet's surface. Bondarenko's team found that the lava flow was hotter than its surroundings---which may mean the lava flow is in the process of cooling. The scientists say the lava flow can't be very old because if it were, it would have cooled off enough that Magellan wouldn't have noticed the difference in microwaves. She adds that the flow appears in a 1978 view of the surface that a craft called the Pioneer Venus Orbiter captured. What happened to Magellan in the end? A) It was floating in space forever. B) It flew into heavy clouds. C) It returned to the Earth. D) It fell onto Venus.
D
(Question)
Captain Henry,a 98"year--old American retired fisherman,has become a first--time author.having written and published his autobiography In a Fisherman's Language after learning to read at the age of 91. Mr.Henry spent most of his life without even his closest family members knowing he wasilliterate .Forced to quit school in the third grade to take odd jobs,he kept the secret close to his chest,only telling his late wife.Henry's granddaughter,Marlisa,told reporters how he used tricks,like waiting for others to order at restaurants first,to avoid the issue. A family dispute in his 90s,she said,aroused his desire for education."He signed a document he could not read about where he was going to live, Marlisa said.Starting with his name,he eventually moved on to the ABC's and children's books.He put them down since his wife fell ill.After the tragic loss of his wife,, he went back to reading and began to log his life.He wrote about his family's voyage from Portugal to the US,how he went on to captain a boat,and his many journeys at sea. His life stories have become so popular that nearly 800 copies were sold in the first two weeks after the book's release.One thousand more have since been printed as requests for the book flood in from as far as Germany.And now even Hollywood producers have approached Mr.Henry about buying the rights to his life story for a big screen adaptation. The family also now has a book agent and a deal in the works to publish a second edition.Meanwhile,the family says they are reconnecting and closer than ever as a result of Henry's.1ate--life efforts.."Everyone has a story,"Marlisa said."It teaches that when you're down and out. never give up." Which of the following is true? A) Hollywood wishes to make a movie out of his book. B) Henry never told anyone that he couldn't read or write. C) Henry began his reading with some famous novels. D) Henry's book was well-received only by Americans.
(Answer)
A
Question: The koala is possibly one of the best known Australian animals, and is found in four states: Queensland, New South Wales, Victoria and South Australia. The word "koala" comes from an Australian aboriginal word meaning "no drink". Sometimes people call them "koala bears" but koala is not a bear. It belongs to a special group of Australian mammals, called marsupial . Female marsupials have a _ where the baby animals live after they are born. Koalas have soft, thick, grey or brown fur on their backs. The fur on the stomach is white. Koala that live in the south have thicker fur than those in the north because of the cold winters, whereas the koalas in the northern part of the country live in warm to hot weather most of the year so have thinner fur. A koala has a large hairless nose and round ears. Koalas don't have tails. Adult koalas measure between 7 and 14 kilograms. Koalas spend nearly all their time in the trees using their sharp, curved claws and long toes to climb about and to hold on to the tree branches. They sleep most of the day, and feed and move from tree to tree mainly at night. The reason koala sleep for much of the day is because their food eucalyptus leaves are very tough so they use a lot of energy to digest. Sleeping saves energy. Eucalyptus leaves are poisonous to almost every other animal. Koalas rarely drink water; they get water from the leaves they eat. Each koala has a home range made up of several trees that they visit regularly. They normally do not visit another koala's home trees except that a male is looking for a female to mate with. Why do koalas sleep much in the day? A) Their foods are poisonous B) They want to save energy for the activities at night C) They can't get enough energy from their tough foods D) They can't get enough water from their leaves
Answer:
C