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答案：A
解析：
Choice A is correct. If the firm only covers the monthly expenses, the profit will be zero. Substituting 0 for P in the given equation and solving for h will give the number of hours of legal advice the firm needs to be paid for in order to break even.
This can be written as:
P=100h-2000
0=100h-2000
2000=100h
20=h
