初中英语题 I don't know the ———— of the family , but I do know it

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初中英语题 I don't know the ———— of the family , but I do know it is very small
A true
B real
C actual
D practical
书上写的答案是B,为什么?我查了下,有答案是C的http://zhidao.baidu.com/question/223325601.html
我本来选的是D,我知道A不可能
求高手解释解释.
漏打了。。SORRY。。I don't know the —— income of the family , but I do know it is very small

答案是c那题的问题是actual income,这里问得是 the real,题都不一样.
这里是名词.real三种词性：
adj.真实的；真的；正宗的；真正的；名副其实的；实际的；现实的；不动产的
adv.非常
n.真实；雷阿尔（昔日西班牙等地的货币）
再问：题漏打了，不哈意思，，那actual practical，为什么不行。。
再答： actual practical是adj
再问：可是是__income 应该是什么的收入啊。。收入是n.，那么前面应该是adj.了呀我题补过了。
再答： real income 是一个固定搭配，意为实际收入； actual income 有实际收入，还有实际收益的意思； practical income意思也是实际收入，但相较之下，人们最常用real income，比较来选择，最好用real income。其他理由我也找不到了。。。希望对你有帮助吧＝＝ PS:如果我遇到这题，犹豫再三，可能还是选real income，读起来更顺畅吧～。～但我的确不觉得其它那两个错。。

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