托福考试培训网

托福听力考试背景知识综合辅导(三十九)

来源：网络发布时间：2011-02-17

    下面是托福听力背景知识，育路教育网特别为您搜集整理，内容如下：

    JUPITER

    Jupiter has thick， gaseous atmospheres and low densities. It has no solid rock surface. The temperature ranges from about -190°F （-124°C） for the visible surface of the atmosphere， to 9°F （-13°C） at lower cloud levels； localized regions reach as high as 40°F （4°C） at still lower cloud levels near the equator. Jupiter radiates about four times as much heat energy as it receives from the sun， suggesting an internal heat source. This energy is thought to be due in part to a slow contraction of the planet. At least 17 natural satellites are known to orbit Jupiter. They are conveniently divided into three groups. The four largest—Io， Europa， Ganymede， and Callisto—were discovered by Galileo in 1610， shortly after he invented the telescope， and are known as the Galilean satellites. A second group is comprised of the four innermost satellites. The final group consists of the eight satellites with orbits outside that of Callisto. The seventeenth satellite， 1999J1， was discovered in 2000. Eleven small previously unknown satellites were reported in 2001. If these sightings should be confirmed， it would raise the number of Jovian moons to 28. … The spot and other markings of the atmosphere also provide evidence for Jupiter‘s rapid rotation， which has a period of about 9 hr 55 min.

• 阅读上一篇：托福听力考试背景知识综合辅导(三十八)
• 阅读下一篇：托福听力考试背景知识综合辅导(四十)

外语项目推荐

报名推荐热线：010-51294614、51299614

机构优惠

报名推荐热线：010-51294614、51299614

育路版权与免责声明

① 凡本网注明稿件来源为"原创"的所有文字、图片和音视频稿件，版权均属本网所有。任何媒体、网站或个人转载、链接转贴或以其他方式复制发表时必须注明"稿件来源：育路网"，违者本网将依法追究责任；

② 本网部分稿件来源于网络，任何单位或个人认为育路网发布的内容可能涉嫌侵犯其合法权益，应该及时向育路网书面反馈，并提供身份证明、权属证明及详细侵权情况证明，育路网在收到上述法律文件后，将会尽快移除被控侵权内容。