B.A Poor Girl
C.Warmhearted Onlookers
D.Brave Frenchman Found
C
Scientists have not found any signs of life on Mars yet, but they say a robotic vehicle called “Curiosity” is helping them learn a lot about the planet's history and climate.
Curiosity landed on Mars in August 2017 after travelling through space for more than eight months. It was sent to Mars by scientists from NASA in the United States.
Curiosity is about the size of a car and has six wheels. It also has a robotic arm, cameras, and instruments that allow it to examine things it finds on the surface. Then it sends the information back to the earth.
Curiosity's main task is to find out if anything could live on Mars, either now or in the past. On Nov. 2, NASA scientists held a press conference (资讯发布会) to discuss what Curiosity had found in its first two months on Mars.(火山) on the earth. Scientists say that studying the minerals in Martian soil will help them understand what conditions were like on the planet in the past. Curiosity also found smooth stones like the ones found on river beds and seashores on the earth, where their rough edges have been worn down by water. Mars is very cold and dry now, but scientists say the smooth stones tell them that a river used to run through the place where they were found.
Curiosity has been testing the atmosphere around Mars for a type of gas called methane (甲烷), but so far it has not found any. On the earth, most methane is produced by plants or animals. Methane on Mars might indicate that some type of tiny plants or animals lived there.It will continue to explore the planet for about two years.
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