问题
选择题
You had better______ some money for special use.
A．pick up
B．set aside
C．put off
D．set up
答案
答案：B
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You had better______ some money for special use.
A．pick up
B．set aside
C．put off
D．set up
答案：B
随着温度的升高而增大，说明水的电离是放热反应
增大