除去下列各组物质中的杂质,所用试剂和方法均正确的是
A.①
B.②
C.③
D.④
答案:B
The Grammar-Translation Method was at one time called ______ since it was first used in the teaching of the classical languages of Latin and Greek.
A. aural-oral method B. minimum methodC. Audiolingual Method D. Classical Method
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