Scientists said they have found evidence of a giant planet far out in our solar system. In a statement, the California Institute of Technology(Caltech) said this planet travels a strange “highly elongated orbit in the distant solar system”.

The discovery was made by two researchers at Caltech; Konstantin Batygin and Mike Brown. They used mathematical modeling and computer simulations (模擬)to find the planet. So far, there have not been any direct observations of the planet. “My jaw hit the floor,” said astronomer Mike Brown, the moment he realized there might be a ninth planet.

The scientists said it would take this planet 10,000to 20,000 years just to make one full orbit around the sun. The new planet, called “Planet Nine” has a mass about 10 times the size of Earth.

It is believed that the planet orbits, or travels, around the sun from a great distance. The planet Neptune’s average distance to the sun is about 4.5 billion kilometers. But “Planet Nine” could be 20 times farther away from the sun than that. While they did not get a picture of “Planet Nine” yet, the scientists say they are using the biggest and best telescopes on Earth to try to find it.

Brown and Batygin reported their finding in The Astronomical Journal. They say that this new planet is so large that there should be no doubt that it is a true planet, once they confirm it.

Robert Massey is with the Royal Astronomical Society in London. He told AFP that planets have been predicted before, and then were not found. But, he said the work of the these researchers is definitely worth following up. “It would be a really exciting thing to find. At the moment it’s simply a prediction.”

1.How was the evidence of the ninth planet found?

A. Through a special telescope

B. Through researchers’ direct observation

C. Through studying its special orbit in the solar system

D. Through mathematical modeling and computer simulations

2.What can we know about “Planet Nine” from the text?

A. It is much smaller than the earth

B. It travels a normal orbit like other planets

C. Its distance to the sun is about 90 billion kilometers

D. Its picture has been caught by the biggest and best telescope

3.What’s Robert’s attitude towards the discovery of “Planet Nine”?

A. Worried B. Supportive

C. Indifferent D. Opposed

4.What’s the best title for the text?

A. The discovery of the largest planet

B. A big prediction of the solar system

C. A ninth planet may be in the solar system

D. The ninth planet has been found in the solar system

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科目：高中英語 來源：山西省太原市2016-2017學(xué)年高二5月月考英語試卷 題型：閱讀理解

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Schedule a Tour

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below to determine which tour is best for you and remember to book at least two weeks in advance.

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1.The underlined word “fad” in paragraph 1 is closest in meaning to “________”.

A. invention B. content

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科目：高中英語 來源：廣東省2017屆高三第三次模擬考試英語試卷 題型：閱讀理解

The exact work of ancient astronomers has led to a modern observation --- our days are longer than they used to be. Not that you’d noticed: The new research in the Proceedings of the Royal Society A shows that it takes the Earth a tiny bit longer these days to complete a single rotation (轉(zhuǎn)動(dòng)) than it did millions of years ago. It’s the kind of stuff that’s measured in milliseconds per century, but those milliseconds add up. Over the last thousands of years, they’d totaled several hours, which the Los Angeles Times puts this way, “If humanity had been measuring time with an atomic clock that started running back in 700 BC, today that clock would read 7 p.m. when the sun is directly overhead rather than noon. The atomic clock won’t lose a second for 15 billion years.” Maybe more remarkable is that the work is the result of a tireless 40-year research into ancient timekeeping records dating back 2,700 years.

Scientists led by Richard Stephenson of the UK’s Durham University have been studying Babylonian clay tablets, Chinese observations made through the use of water clocks, and Arab astronomical records that tracked solar and lunar eclipses(日/月食). “The most astonishing thing about this study is the fact that we have this information at all,” said a geographer not involved in the study. Researchers are still hoping to find observations from the Incas and the Maya, and to fill in their largest hole between 200 and 600 AD, but they’ve measured the Earth’s deceleration at 1.8 milliseconds per day per century. Given the moon’s gravitational effect on our oceans, the discovery that Earth is decelerating isn’t a surprise, notes the Christian Science Monitor, though astronomers had previously estimated a higher rate.

1.Why are days longer than before according to the text?

A. The earth rotates more and more slowly.

B. Humanity has got incorrect timekeeping records.

C. It takes longer for the earth to turn around the sun.

D. The lost milliseconds for centuries are added to our present days.

2.How did researchers come to the conclusion of the study?

A. By resetting the rotating time of the earth.

B. By referring to ancient timekeeping records.

C. By studying the moon’s gravitational effect on the oceans.

D. By measuring time again with an atomic clock.

3.What can we infer about the study from what the geographer said?

A. Geography theory supports the result of the study.

B. The geographer disagrees to the research conclusion.

C. The scientists’ research is meaningless.

D. It’s right to get geographers involved in the study.

4.What is the meaning of the underlined word “deceleration” in Paragraph 2?

A. Evolution. B. Slowdown.

C. Enlargement. D. Development.

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