The earth is not the only body that travels around the sun. With it are eight other planets, fellow members of the sun’s family.
Two of them, Mercury (水星) and Venus, are nearer while the other six, namely Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, also in their given order from the sun, are farther from the sun than the earth is. The farther they are, the longer trips they make around the sun. People noticed long ago that these traveling bodies moved around in the sky in definite paths. It is a force called gravity that holds them in their paths.
We know that every little bit of matter in the universe pulls upon every other bit of matter. The pull between two bodies is proportional (成比例的) to the product of their masses. Because the sun is so large the pull between the sun and the planets are thus great. If it were not for this pull, the planets would fly off into space. In the same way there exists a pull between the earth and the moon, which keeps the moon traveling in its orbit around our planet, the earth. Gravity holds you to its surface, and pulls back to it the ball which you throw into the air. Of course the ball also pulls on the larger earth but the earth is so much larger that the pull is not noticed.
Now remember that large bodies exert a greater pull than smaller ones which contain less material. But each object in the universe, no matter how small, pulls on all other objects to some degree.
小題1:There are ________ that travel around the sun in the sun’s family.
A．nine planetsB．eight planets
C．one star and ten planetsD．the earth and the sun
小題2:Which two planets make the longest trips around the sun among all the planets in the solar system?
A．Mercury and Venus.B．Neptune and Pluto.
C．Saturn and Uranus.D．Mars and Jupiter.
小題3:From the passage we can see__________
A．a(chǎn)ll the objects, big or small, must exert the same pull on one another
B．large objects exert the same pull on anybody as small objects
C．small objects exert the same on large ones
D．each object in the universe exerts a pull on all other objects
小題4:From the sentence “The pull between two bodies is proportional to the product of their masses.” We can infer that the pull between__________
A．the sun and the moon is greater than between the sun and the earth
B．the earth and the moon is greater than that between the sun and the earth
C．the sun and the earth is greater than that between the earth and the moon
D．the sun and the earth is the same as that between the earth and the moon

小題1:A
小題2:B
小題3:D
小題4:C

試題分析：文章介紹了太陽系圍繞太陽轉(zhuǎn)的星球相互的關(guān)系，引力的大小并且解釋了這種現(xiàn)象的原因。
小題1:細(xì)節(jié)題：從第一段的句子：The earth is not the only body that travels around the sun. With it are eight other planets, fellow members of the sun’s family.可知共有9個(gè)星球圍繞著太陽轉(zhuǎn)。選A。
小題2:細(xì)節(jié)題：從第二段的句子：Neptune and Pluto, also in their given order from the sun, are farther from the sun than the earth is. The farther they are, the longer trips they make around the sun. 可知Neptune and Pluto.是繞太陽的路程最遠(yuǎn)。選B
小題3:細(xì)節(jié)題：從最后一段的句子：But each object in the universe, no matter how small, pulls on all other objects to some degree.可知答案是D
小題4:句意理解題：從后面的句子：Because the sun is so large the pull between the sun and the planets are thus great.可知體積越大，天體的引力就越大。選C
點(diǎn)評：本文屬于科普文章，細(xì)節(jié)題居多，答題時(shí)在文章找到對應(yīng)的地方，用筆進(jìn)行標(biāo)記，這有利于后期有時(shí)間檢查時(shí)可以立刻找到答案的位置。仔細(xì)理解作者所講的意思，再結(jié)合選項(xiàng)，通過排除法和自己對全文的把握，選出正確答案。
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B．To save lives of people.
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D．To help the U.S. Naval test equipment.
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C．These mammals can carry out a task everywhere.
D．A lot of countries will train dolphins and sea lions for anti-terrorism.
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