122.C[解析]此题计算较复杂,首先计算出各月存量如下:
3月:922.35-416.58=505.77;4月:1467.5-922.35=545.15;5月:2097.9-1467.5=630.4;6月:2821.3-2097.9=723.4;7月:3466.8-2821.3=645.5。
再计算各月增量:
4月:545.15-505.77=39.38;5月:630.4-545.15=85.25;6月:723.4-630.4=93;7月增量为负数。故6月增加值最大,选C。
123.D[解析]4143.7÷(1+24.2%)≈3336.3(亿元)。
124.D[解析]2690.2+11103.5=13793.7(亿元)。
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