Everything that humans hear is in the form of waves. Just as the eye sees light waves in the form of color1s, the ear hears sound waves in the form of noises. The ear and the eye turn these different waves into signals that the brain can make sense of. The ears and brain have an amazing ability to recognize particular sounds. For example, a mother often can tell when her baby is crying even if there are other crying babies in the same room. This is because the sound of her baby's cry has special meaning to her and the brain has recorded its importance. The ability to recognize sounds improves with experiences. As the brain receives information about sounds from day to day, it stores the information in its memory. When the brain hears new sounds, it gives meaning to them based on the information already in the memory. This is why certain words or songs can make a person happy. Often it is not the words or songs themselves that cause this feeling. The sounds are connected to happy memories for that person. Another hearing process controlled by the brain is to decide where a sound is coming from. One ear is usually closer to the source of a sound than the other ear is. Sound waves are stronger when they reach the ear that is closer. They also reach the closer ear first. The brain recognizes these differences and uses them to decide the location of the source of the sound. Why does a person feel happy when they hear some songs? A) Because certain words or songs can make a person happy. B) Because a person has the ability to recognize the sounds C) Because the certain sounds are connected to happy memories for that person. D) Because the person feel the song is special
C
(Question)
Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space. This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over the next several centuries as a result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling. This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat. Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling. "We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere." Scientists tracked the change in the amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when... .From the passage we can draw a conclusion that forest fires in Alaska, Canada and Siberia may _ . A) warm the climate as the supposition goes B) allow more snow to reflect more sunlight into space and thus cool the climate C) destroy large areas of forests and pollute the far-off sea ice D) help to gain more energy rather than release more energy
(Answer)
B
Ques: Winslow Homer was the second of three sons of Henrietta Benson and Charles Savage Homer. He was born in Boston, Massachusetts in 1836 and grew up in Cambridge. His father was an importer of tools and other goods. His mother was a painter. Window got his interest in drawing and painting from his mother. But his father also supported his son's interest. Once, on a business trip to London, Charles Homer bought a set of drawing examples for his son to copy. Young Winslow used these to develop his early skill. Winslow's older brother Charles went to Harvard University in Cambridge. The family expected Winslow would go, too. But, at the time, Harvard did not teach art. So Winslow's father found him a job as an assistant in the trade of making and preparing pictures for printed media. At 19, Window learned the process of lithography .This work was the only formal training that Winslow ever received in art. In 1859, Window Homer moved to New York City to work for Harper's Weekly. Homer also started to paint seriously. He hoped to go to Europe to study painting. But, something would intervene the direction of Window Homer's artistic work. Harper's magazine would send him to draw pictures of the biggest event in American history since independence. It was the Civil War between the Union and the rebel southern states. Winslow Homer went to Washington, D. C., in 1861. He drew pictures of the campaign of Union Army General George McClellan the next year. His pictures of the war showed many ways that conflicts affect people. Who had the same interest as Window according to the text? A) His father. B) His mother. C) His teacher. D) His brother.
Ans: B
Question: Today many people say that women have the same chance as men in society. But this was not always so. In the past, women all over the world had to fight to get the same chance as men in education and jobs. Many people said that women should not receive much education because they would not do as well as men when they went to work. One woman who showed that women should have the same chance was Marie, a scientist. In the 1800s scientists knew that a metal, uranium, gave off radiation. They also knew how much radiation came from his element. But they didn't know what this radiation was like; they wondered why and how uranium gave off radiation. Marie Curie set out to answer these questions. In one of her experiments she was studying a certain material which, she knew, contained uranium, But it gave off 4 times as much radiation as usually does. What could explain this fact? Marie Curie thought that there must be another source of radiation in this material. In 1898 Marie Curie set out to find out this new source of radiation, which she named "radium". Her husband, who was also a scientist, helped her. They set up a laboratory in an old building behind a school. For four years Curies searched, doing many experiments, And one morning in 1902 Marie found the source of the radiation. Marie Curie proved to the world that there was element that gave off radiation. And she also proved to the world that, if women are given truly equal chance, they can really help society. The Curies found the element radium . A) with other scientists' help B) by asking some famous scientists C) by doing many experiments D) with their teachers' help
Answer:
C