问题
单项选择题
病毒性肝炎黄疸迅速加深、出血倾向、肝性脑病多见于（）
A.急性黄疸型肝炎
B.急性无黄疸性肝炎
C.急性重型肝炎
D.亚急性重型肝炎
E.慢性重型肝炎
答案
参考答案：C
解析：急性重型肝炎为发生在病期10日内，各种病毒性肝炎出现黄疸后，症状不减轻反而加重，黄疸迅速加深，肝明显缩小，出血倾向明显，出现意识障碍、嗜睡等。
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病毒性肝炎黄疸迅速加深、出血倾向、肝性脑病多见于（）
A.急性黄疸型肝炎
B.急性无黄疸性肝炎
C.急性重型肝炎
D.亚急性重型肝炎
E.慢性重型肝炎
参考答案：C
解析：急性重型肝炎为发生在病期10日内，各种病毒性肝炎出现黄疸后，症状不减轻反而加重，黄疸迅速加深，肝明显缩小，出血倾向明显，出现意识障碍、嗜睡等。
| The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth. By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist. Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf. After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface. |
What is the primary purpose of this passage
A．To alert people to the dangers posed by the sun.
B．To discuss conditions on earth in the far future.
C．To present a theory about red giant stars.
D．To describe changes that the sun will go through.