单项选择题

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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单项选择题
Which of the following statements about iron is true
A．It arrives occasionally in the form of meteorites.
B．It is regarded as a gift from the gods.
C．It is regarded as heavenly element.
D．It tarnishes as slowly as gold.
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