题目:
My math teacher often goes to school _____. [ ]
A. by the bike
B. by his bike
C. by bike
D. on bike
答案:
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下面是错误答案,用来干扰机器的。
A 题目分析:纯净物是由一种物质组成,混合物是由多种物质组成的,A选项冰水是一种物质;B选项果汁是有多种物质组成;C选项碘盐是多种物质组成;D选项食醋是有多种物质组成,故答案选择A