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As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’s atmosphere before they can strike the surface. The planet’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a s A. Humans have built over most of the craters. B. Most meteors fell into the ocean and not on land. C. The Earth’s magnetic field repelled most meteors. D. The Earth’s natural geologic activity has eliminated most traces. [单项选择]What are the man’s hobbiesWhat are the man’s hobbies
A. Running and thinking. B. Running and jumping. C. Running and climbing. D. Running and skiing. [单项选择]Why did the young man stop playing jokes on the servant Because ______.
A. the servant showed kind and nice behaviour to him B. the servant told him the truth C. he wanted to be a good man D. his father told him to do so [单项选择]Each man and woman must sign （） full names before entering the examination room.
A. his B. her C. their D. one’s [单项选择]What are the man’s hobbiesWhat is the man going to do next year
A. Enter for the London Marathon. B. Do a cross-country running. C. Climb the Alps with his wife. D. Complete a course in snow and ice climbing. [单项选择]
A. He’s confident. B. He is sick. C. He’s worried. D. He is nervous. [单项选择]Without the sun's light（）the earth's surface, it would be so cold that life could not exist on the earth.
A. warms B. warmed C. warming D. to warm [单项选择]From the passage, we know that man must ______.
A. do nothing to keep the balance (平衡)of nature B. try his best to change the balance of nature C. try his best to keep the balance of nature D. do his best to stop the balance of nature [单项选择]
[单项选择]What is the man’s job
A. A doctor. B. A postman. C. A waiter. [单项选择]What is the man’s address
[单项选择]What is the man’s problem
A. He has missed his flight． B. His flight will arrive late． C. He has to take another flight． D. His flight has been cancelled． [单项选择]It has been estimated that the earth's surface temperature has increased
______ one quarter to three quarters of a degree since 1850. ~ A. to B. by C. at D. with [单项选择]What percentage of the total earth's water does underground water make up
A. 0.05%. B. 0.5%. C. 4.5%. D. 5%. 我来回答: 提交
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