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单项选择题

Why does the bride wear something old at the wedding?

A．It represents that she still misses her ex-boyfriend.
B．It represents her continued ties to her family and her old life.
C．It represents her decision to say goodbye to her old life.
D．It represents the bride’s past experiences.

问答题

水玻璃的化学组成是什么？水玻璃的模数、密度（浓度）对水玻璃的性能有什么影响？