单项选择题

Which of the following nomenclature is correct for ?
A、sodium borate
B、sodium boron
C、sodium borite
D、sodium boride

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单项选择题

化学消毒剂浓度越高，消毒效果越好。

多项选择题

Pre-writing activities often used to serve the function of ________.
A、arousing their interest
B、activating their prior knowledge
C、getting them relaxed
D、guiding them to focus on the task