重要提示：
请勿将账号共享给其他人使用，违者账号将被封禁！
题目
For many years, Mars had been thought of as the planet with the man made canals, supposedly discovered by an Italian astronomer, Schiaparelli, in 1877. With the United States spacecraft Viking I's landing on 'Mars in 1976, the man-made canal theory was proven to be only a myth.
Viking I, after landing on the soil of Mars, performed many scientific experiments and took numerous pictures. The pictures showed that the red color of the planet is due to the reddish, rocky Martian soil. No biological life was found, though it had been speculated by many scientists. The Viking al so monitored many weather changes including violent dust storms. Some water vapor, polar ice and permafrost were found, indicating that at one time there were significant quantities of water on this distant planet. Evidence collected by the spacecraft shows some present volcanic action, though the volcanoes are believed to be dormant, if not extinct.
Which of the following is true？
A．Mars is larger than the Earth.
B．Mars had Viking as its moon.
C．Martian soil is brownish rod.
D．It takes longer for Mars to circle the Sun than it takes the Earth.
更多“Of the six outer planets, Mars, commonly called the Red Planet, is the closest to Earth. M”相关的问题
第1题
A．where a planet or planets
B．a planet or planets so
C．which a planet or planets
D．a planet or planets
第2题
Seen from the outer space, the earth is much smaller than the other planets or stars.
A．Y
B．N
C．NG
第3题
A．where a planet or planets
B．a planet or planets so
C．which a planet or planets
D．a planet or planets
第4题
The passage is mainly concerned with ______.
A．the feasibility of life existing on other planets
B．the description of Mars's physical environment
C．the comparison between the physical features of Mars and the Earth
D．the feasibility of men's migrating onto Mars
第5题
According to the passage, what has been a major focus of research about Mars？
A．How Mars compares to other planets in the solar system
B．Who built the network of canals on the surface of Mars
C．Whether signs of water indicate that life has existed on Mars
D．How soon astronauts from Earth will be able to go to Mars
第6题
A．direct proof that life has existed on Mars
B．the rejection of Schiaparelli's ideas by other scientists
C．the search for canals on other planets in the solar system
D．new questions about intelligent life on Mars
第7题
It can be inferred from the text that______.
A．discoveries of new planets set scientists thinking
B．extrasolar planets exist in the universe
C．solar system should be re-examined by mankind
D．new discovery depends on new theory
相关内容
After three hours of questioning the suspect broke down and ().
The explosive growth in casinos is one of the most () signs of Westernization.
The respondent would advise the new channel to （）.
They used to quarrel a lot, but now they are completely () with each other.
In the clash between environmentalists and developers, the Indians, () presence is in fact crucial to the survival of the forest, have suffered the most.
Believe it or not, when first () to Europe, tomato was thought to be poisonous.
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“赏学吧”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
