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单项选择题
预防牙周病最好的刷牙方法为
A、巴斯刷牙法
B、横刷法
C、竖刷法
D、圆弧刷牙法
E、擦洗方法
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In some countries where there is high level of poverty, and where many parents are illiterate, 'Books in Homes' program have been launcheD.
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丙酮酸羧化酶的活性可被下列哪种物质激活。 A.
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Prospectus(图书简介): The goal of the book Idioms(习语) is getting you to understand, speak and write everyday idioms in everyday English. The first half of this book will assume you can recognize about 2,000 words, understand the syntax(语法) of plain conversations and use the simple tenses. Therefore, either advanced or intermediate learners can use this book.
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