大学英语六级阅读Speed Reading实战练习

orbit around the Sun at thirty-five million miles.

　　Mars is a small planet that has a red glow. It makes one complete orbit around the Sun in six hundred and eighty seven days. Oxygen and water vapor have been detected in the atmosphere of Mars, and a yellowish fog and clouds move around the planet indicating that the planet has different types of weather and seasons like the earth. A single day on Mars is very much like a day on earth lasting twenty-four hours and thirty-seven minutes, however, a year on Mars is twice as long as one year on earth.

　　Jupiter the fifth planet from the Sun gets its name from the Father of the Greek Gods. Jupiter, which orbits four hundred eighty-three million miles from the Sun, is the biggest of all the planets in our solar system. It has a diameter of eighty-nine thousand miles and a volume of thirteen times that of earth. Jupiter orbits the Sun every twelve years. Its atmosphere is thousands of miles thick and is made up of mainly hydrogen. The surface temperature is about -205°F. There are no seasons on Jupiter, but it has floating clouds of ammonia and methane gas.

　　Jupiter has a bright red distinctive spot that is more than twice as wide as Earth. This mark has astronomers puzzled because there is no reason for the bright spot due to the fact that it does not receive much Sunlight. This spot enables us to see that Jupiter has a very fast rotation. One rotation is completed every ten hours. The forces placed on the planet due to this quick rotation cause the clouds at the equator to bulge like a tire, but due to the gravitational forces of the planet keep the clouds from being cast into space.

　　Saturn, even though it is the sixth planet form the Sun, it shines so brightly because of its size. Its diameter is seventy-one thousand five hundred miles. The planet itself is golden in color and is the brightest yellow star in the night sky.

　　Saturn makes one complete revolution on its axis every ten hours and takes twenty-nine and one half days to complete one orbit around the Sun. The gravitational pull of this planet is most like that of Jupiter. It has a volume that is eight hundred times that of earth, but has a volume that is one hundred times lighter than earth.

　　Saturn has two rings that surround the planet, but never touch it. They are located outside the atmosphere and above the equator. These rings are only about ten miles thick, which makes them transparent, only being seen with the use of a telescope. The ring closest to the planet is about seven thousand miles and very thin. A black band separates the inner ring from the outer ring, which is wider and brighter. It is believed that the rings are made up of crystals of ice or dust particles.

　　Uranus is the seventh planet form the Sun. The name Uranus comes from Greek mythology. Uranus was the ¨God of the Heavens.〃

　　Uranus is situated one thousand seven hundred and eighty two miles form the Sun and

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