某工地水泥从两个地方采购，其采购量及有关费用如下表所示，则该工地水泥的基价为（）元/t。
A. 227.5
B. 243.12
C. 250.4
D. 271.08
She greets (打招呼) Mr. Smith because she ______
A. thinks he is her husband (丈夫)
B. thinks he is the father of her own children
C. thinks be is the father of two students of bets
The man ran in because ______
A. be was in
B. be wanted to sleep
C. he wanted to tell the dentist that his house was on fire
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