托福寫作模擬試題：土星衛(wèi)星不同尋常特征

　　新托福綜合寫作回顧

　　閱讀主要觀點提�。�

　　土星最大的衛(wèi)星Titan存在三個無法解釋的不同尋常的特征。

　　第一，Titan的軌道是橢圓形elliptical而不是常規(guī)的圓形circular。

　　第二，Titan的兩極地區(qū)存在洼地depressions。這些洼地既不是火山爆發(fā)形成的也不是隕石撞擊形成的。

　　第三，Titan上沙丘的坡向與Titan所吹的風(fēng)向相反。

　　聽力主要觀點提�。�

　　最新的研究表明，Titan上的這些特征都可以有合理的解釋。

　　第一，關(guān)于橢圓形的軌道。Titan并不是單一的衛(wèi)星，而是多個衛(wèi)星碰撞collide后合并merge在一起的。每次的碰撞，都會形成一定的沖擊力impacts，這種沖擊力就會改變軌道。隨著時間的推移，軌道就變成橢圓形elliptical。

　　第二，關(guān)于洼地。Titan上洼地的形成類似于地球上的洞穴caves。由于Titan上有降雨rainfall，并且降雨集中在Titan的兩極地區(qū)。所以Titan兩級地區(qū)的巖石被雨水分解dissolve,形成depressions。

　　第三，關(guān)于沙丘的朝向。Titan上的沙子很重，一般的風(fēng)吹不動。Titan每年會有幾次風(fēng)力很大的朝東吹的風(fēng)暴storms，它的風(fēng)力是平常風(fēng)的十倍，可以將沙子往東吹。

　　新托福綜合寫作范文：

　　The reading passage claims that there are three unusual features about Titan that cannot be explained, while the speaker thinks that each of the features has a reasonable explanation.

　　To begin with, the reading states that the orbit of the Titan is elliptical rather than circular, which is quite puzzling and abnormal. According to the lecture, however, this phenomenon is caused by the fact that Titan is originally not a single moon but the combination of several smaller moons, which compounds its orbit. The orbit is shifted by the force of each colliding slightly and becomes elliptical over time.

　　In addition, the author argues that the existence of depressions in Titan's polar areas is dubious, since they cannot be explained by volcanic activities or meteorite impact. The professor refutes this argument by pointing out that there are frequent rainfalls in Titan and it is those liquids that formed the multiple caves on Titan, as the case on earth.

　　Finally, contrary to the belief in the passage that the slope of the dunes on Titan is not in compliance with the force of the wind, the lecturer contends that the sand on the moon is so heavy that only those storm winds, ten times stronger than the usual wind, can determine the eastward slope of the dunes. (216 Words)