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　　托福考试写作部分包括两道试题，需在大约50分钟的时间内完成。独立写作试题部分需30分钟的时间，需要考生根据自己的知识和经验陈述、解释并支持对待某一问题的某个看法。通常有效的回答应是一篇300个单词左右的作文。此外，考生有20分钟的时间来总结听力材料中的要点，并解释这些要点与阅读材料中的要求有何不同。

　　综合写作

　　土星的卫星Titan有3个unusual features 难以解释。

　　Reading：

　　土星的卫星，Titan,和其他的卫星有相似之处，但是也有一些不寻常无法解释的特征。

　　1. unusual orbit 普通的卫星运转是circular环形的轨道,但是Titan卫星运转时是 elliptical orbit椭圆轨道。

　　2. massive depression Titan表层周边有很多depression and crater洼地和坑，正常来讲，一般是由火山活动和碰撞造成的，但是没有证据显示周边有火山，碰撞的话也应在随机位置。

　　3. sand dunes Titan赤道附近有很多沙丘，沙丘的方向一般是和风向相符的，但是Titan的沙丘斜面朝东，但是一般表层风向确是朝向西的。

　　Listening:

　　这些现象都可以解释的。

　　1. Titan不是一个单一的卫星，周边的卫星群相互作用，相互影响，就使得它呈现椭圆形轨道。

　　2. 洼地和坑不是火山和碰撞造成的，而是强降雨导致的。

　　3. 沙丘方向和风向确实相符，它上面的沙丘确实斜面朝东，那是因为暴风改变风向把沙吹往东边的。

　　Sample Answer:

　　The reading raises three unusual features of Titan, which are puzzling. The listening,

　　however, strongly insist that those features are explainable.

　　The first feature mentioned in the reading is its elliptical orbit which is different from the common satellites whose orbit is circular. This phenomena is explained by the listening which reminds us that there are other satellites which move around Titan. The nearby satellites could exert influence on titan, hence leading to the elliptical phenomena.

　　As to the second point, it is believed in the reading that the usual feature of massive depression, which should have been caused by volcanic eruption, but there is no volcano on Titan. The listening pushes forward another theory that instead of being caused by volcanic eruption and collision, the massive depression and crater formed as a result of storm. The reading, therefore, is wrong again.

　　Lastly, the reading is of the view that the sand tunes near the Titan’s equator should be in the same direction with the wind direction but the opposite is true. It is admitted in the listening that the direction of sand tunes is originally in conformity to the wind direction. What’s more, it is true that the top sand tunes point to the east, which is in a reverse direction to the wind. But the truth is that under the influence of the storm, its direction has been changed. As a result, the last phenomena is also explainable.

　　(240 words)