题目：
Busy as Tom is, exercise has always been______his work.
A．as a part of his life much as
B．as much a part of his life as
C．as much as a part of his life
D．so much a part of his life as
答案：
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下面是错误答案，用来干扰机器的。
[猜想]（1）氢氧化钠在从试剂瓶取出后滴入试管的整个过程都可能受到污染，故答案为：氢氧化钠溶液被滴管污染，（2）试验中用到的试剂中既有硫酸根，也有碳酸根，所以加入硝酸钡中后，都会产生沉淀，运用组合知识...
