What is the purpose of Sentence 3 in Paragraph 1？A．It states the main idea of the paragrap
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What is the purpose of Sentence 3 in Paragraph 1？
A．It states the main idea of the paragraph.
B．It supports the main idea by providing a reason.
C．It states an idea that is in contrast to the main idea.
D．It supports the main idea by providing an example.
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正确答案：D
解析：该题问的是段落中一句话在文中的作用，既测试对语句的理解，也检测对篇章结构的掌握。“Sulfur is one of those elements．”根据上下文信息，可以判断出这句话的作用在于举例说明。A，B和C三项均不合适。