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托福阅读句子插入题：Spartina

2015-08-24 16:23:40来源：网络

　　【托福阅读题型：Spartina句子插入题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子插入题

　　托福阅读句子插入题：Spartina

　　Spartina is an exceedingly competitive plant. ■ It spreads primarily by underground stems; colonies form when　pieces of the root system or whole plants float into an area and take root or when seeds float into a suitable area and　germinate. ■ Spartina establishes itself on substrates ranging from sand and silt to gravel and cobble and is tolerant of　salinities ranging from that of near freshwater (0.05 percent) to that of salt water (3.5 percent). ■Because they lack　oxygen, marsh sediments are high in sulfides that are toxic to most plants. ■ Spartina has the ability to take up sulfides　and convert them to sulfate, a form of sulfur that the plant can use; this ability makes it easier for the grass to colonize　marsh environments. Another adaptive advantage is Spartina’s ability to use carbon dioxide more efficiently than most other plants.(Spartina)

　　! Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　Spartina is particularly able to tolerate high salinities because salt glands on the surface of the leaves remove the salt from the plant sap.

　　Where would the sentence best fit?

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 句子插入题

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