地西泮水解中可逆的发生在（）。
A.1，2位水解
B.2，3位水解
C.4，5位水解
D.5，6位水解
参考答案：C
Peter's father asked him to spend his time on something________researching into instead of playing all the time.[ ]
A. worthy
B. valuable
C. worth
D. precious
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