单项选择题

细菌对抗菌药不敏感的现象称为细菌耐药性。

A．对
B．错

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单项选择题

The famous Niagara Falls are located on the US-Canadian border ________.

A．between Lake Erie and Lake Ontario
B．between Lake Huron and Lake Erie
C．between Lake Michigan and Lake Huron
D．between Lake Superior and Lake Michigan

单项选择题

洗涤用品中表面活性剂含量越高，去污力越好。
A、正确
B、错误