正常情况下肠鸣音每分钟应为多少次（）。
A.4~5次
B.6～7次
C.2~3次
D.小于2次
E.8～9次
参考答案：A
What day is it? [ ]
A. It's Monday, July twelfth.
B. It's July twelfth, Monday.
甲烷细菌methanebacteria
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