托福阅读修辞目的题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的修辞目的题及其对应的解析，供大家参考使用。本文带来的是TPO31-3的修辞目的题，一起来看看吧。
TPO31-3 Savanna Formation
Paragraph 2:
Savannas typically experience a ratherprolonged dry season. One theory behind savanna formation is that wet forestspecies are unable to withstand the dry season, and thus savanna, rather thanrain forest, is favored on the site. Savannas experience an annual rainfall ofbetween 1000 and 2000 millimeters, most of it falling in a five-to-eight monthwet season. Though plenty of rain may fall on a savanna during the year, for atleast part of the year little does, creating the drought stress ultimately favoringgrasses. Such conditions prevail throughout much of northern South America andCuba, but many Central American savannas as well as coastal areas of Brazil andthe island of Trinidad do not fit this pattern. In these areas, rainfall permonth exceeds that in the above definition, so other factors must contribute tosavanna formation.
2.In paragraph 2，the author mentions savannas in CentralAmerica, Brazil, and the island of Trinidad in order to
A.argue that thesesavannas are similar to those in South America and Cuba.
B.point outexceptions to the pattern of savanna formation in areas with drought stress.
C.provideadditional examples of savannas in areas with five- to eight-month wet seasons.
D.indicate areaswhere savannas are being gradually replaced by rain forests.
2.以savannas in Central America, Brazil,and the island of Trinidad作为关键词定位到原文，看到这半句和前 半句中间有but的转折，那么也就是说central America，Brazil这些地方和前面介绍的不一样，所以是例外情况。
段落翻译：热带草原通常会经历十分漫长的旱季。热带草原形成理论之一，就是湿润的森木物种无法承受干燥的季节——这更有利于热带草原，而不是热带雨林的形成。热带草原的年降水量在1000到2000毫米，绝大多数降水都集中在长达5到8个月的雨季中。虽然每年的降水总量充足，但至少会有几个月几乎零降水，由此引起的干旱使得该地区最终只适合草地生长。这样的条件广泛地分布于南美北部和古巴的大部分地区，但也有例外，比如在中美洲的稀树大草原，巴西的沿海地区和特立尼达岛气候的类型就不一样。在这些地区每月的降水量超过了之前定义的降水量范围，因此还有其他因素影响着热带草原的形成。
以上就是托福阅读TPO31-3中的修辞目的题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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