This is ruler and that’s e...

This is ______ ruler and that’s ______ eraser.

A. a; a B. a; an C. an; a D. an; an

B 【解析】试题分析：句意：这是一把尺子，那是一块橡皮擦。第一空后的ruler是以辅音音素开头的单词，所以用不定冠词a,第二空后的单词eraser是以元音音素开头的单词，所以应该用不定冠词an;故选B。考点：考查冠词的用法。

考点分析：

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This is ______ ruler and that’s ______ e...