A 2 billion year old Martian (火星的rock appeals to have at our time been full of water from the surface of the Red Planet.

“Here we have a piece of Mars that I can hold in my hands. That’s really exciting,” Carl Agee, director of the Institute of Meteoritics at the University of New Mexico, told the Associated Press.

Agee led a team of scientists who published their report on the newly discovered meteorite （隕石），nicknamed Black Beauly, The rock is estimated to have contained 6,000 parts per million water? and scientists believe it likely interacted with water at a time when most of the planet’s surface was believed to have been arid.

The baseball-size rock was discovered in the Sahara, and scientists say it contains more evidence of water than any of the other known Martian rock samples.

“It’s fairly fresh. It hasn’t been subjected to a whole lot of weathering (風(fēng)化作用），” University of Alberta meteorite expert Chris Herd told the AP.

Billions of years ago an eruption on the surface of Mars, likely caused by a volcano or planet collision, sent the rock into space, where it eventually made the journey to Earth, Agee and his team said the sample is “strikingly similar to the volcanic rocks examined by the NASA rovers Spirit and Opportunity on the Martian surface.”

Over the years, scientists have collected more than 60 Martian rock samples, with most being discovered in the Sahara and Antarctica. The new sample is much older than most of the other specimens, which are about 600 million years old or younger. The oldest known sample is an estimated 4.5 billion years old.

1.The underlined word “it”in Paragraph 3 refers to “ ”.

A. Mara B. the Red Planet

C. Black Beauty D. the report

2.Where was the meteorite found?

A. In the Sahara. B. In Antarctica.

C. In Mars. D. In America.

3.Which of the following is NOT true according to the passage?

A. Black Beauty has the size of a baseball.

B. Blank Beauty contains the most evidence of water among the known Martian rock samples.

C. An eruption on the surface of Mars sent the rock into Earth directly.

D. Black Beauty is not the oldest known sample.

4.Where can we most probably read this text?

A. In a personal diary. B. In a science report.

C. In a travel magazine. D. In a geography textbook.

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