Different trees are mentioned in Paragraph Two as examples toA．set a criterion as to what
正确答案
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Different trees are mentioned in Paragraph Two as examples to
A．set a criterion as to what are ancient trees.
B．introduce the rich species of ancient trees.
C．compare different kinds of ancient trees.
D．explain the definition of ancient trees.
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正确答案：D
推断题。第二段中所举的例子应是用于说明该段主旨句，而本段的主旨句可以认为是首句，即要解释何为古树。接着第二句进行了简要的定义，可见该段的中心意思就是要给古树下定义，其后的例子是对定义进行解释说明，故[D]为答案。第三句前半句已经明确指出Thereisnostrictcriterion“没有严格的标准”，故排除[A]；[B]项“介绍丰富的古树种类”和[C]项“比较不同的古树品种”均与段落主旨句无关，因此也应排除。