假定某电信企业在现有网络设施基础上，提供三项业务，分别为Y1、Y2、Y3.为进行成本收益分析，需要估算每一种业务的单位成本。收集到的数据如下：
业务种类业务收入(亿元)专属成本(亿元)公共成本(亿元)
业务种类业务收入(亿元)专属成本(亿元)公共成本(亿元)
Y163.82.4
Y251.9
Y330.6
根据以上数据资料，为了测算各项业务的单位成本，可以采用的思路有()。
A.自上而下
B.自下而上
C.从外向内
D.从内向外
参考答案：A
On the afternoon of October 13th, 2011 in Foshan, a two-year-old baby girl was playing in the street while her parents were busy working at their shop.But unfortunately, a truck went by and knocked into this poor girl.What's worse, without stopping to help the girl, the truck went over her, making this poor girl badly hurt.In the next 7 minutes, another truck went over her, and 18 passersby just walked past without taking notice of the poor baby.At last, this girl was saved by an old woman who collected waste in the streets, but unluckily the baby girl was so badly hurt that she died at last. This event aroused harsh criticism (引起强烈批判) on the Internet.But why do people seem so kindhearted only on the Internet, but actually in the daily life we can hardly see them help each other? Lots of people made comments online: If you save someone who's hurt, he may say it's you who hurt him.You may have trouble when you do a good deed, because the law doesn't protect you. We really need to learn from other countries in such cases.For example, in Singapore, if someone does wrong to the one who helps him, he has to say sorry in public and pay 3 times the medical fee as punishment. Information Card
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