题目内容
阅读理解
Jupiter's Moons and How They TravelThere are many moons of Jupiter travelling around the planet in different directions.
Jupiter is the largest planet in our solar system (太阳系). Over the years, scientists have found that Jupiter has its own small solar system. Earth has one moon. Jupiter has at least sixteen and probably more.
Since there are so many moons, scientists began to number them. The numerals ( numbers)tell the sequence, or order, in which the moons were found. They were slower to name the moons. All of Jupiter's moons now have a name as well as a number.
The first five moons to be discovered are known as the “inner moons” . But they are not the closest to the planet. The closest is only 127,600 kilometers away from Jupiter. All the inner moons circle the planet in counter-clockwise direction, that is, opposite of the hands of a clock.
Jupiter's middle group of are at least 11,100, 000 kilometers from the planet. They also move in a counter-clockwise motion ( moving). The four farthest moons are at least 20,700,000 kilometers away. These are called “ outer moons” . They circle in a clockwise motion.
How many more moons do you think will be discovered?
1.Things that travel in the same direction as the hands of a clock are said to be traveling in a ________.
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A.clockwise direction
B.counter-clockwise direction
C.same direction
D.different direction
2.Jupiter's ________ group of moons travel in a clockwise direction.
[ ]
3.The numbers given to Jupiter's moons tell ________.
[ ]
A.the order in which they were discovered
B.the order in which they travel
C.the order of their distance from Jupiter
D.the order of names
4.According to the passage, which of the following statements is true?
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A.None of Jupiter's moons have names .
B.Most of Jupiter's moons circle clockwise.
C.Jupiter's inner moons were discovered first.
D.Jupiter is the nearest planet to the earth.
解析:
1.A 导解:顺逆时针方向,clockwise direction;逆时针方向,counter-clockwise direction.因而A正确. 2.D 导解:由第五段最后一句可知. 3.A 导解:从第三段可推测出A正确. 4.C 导解:第四段的第一句道出答案C. |