循行于下肢外侧中线的是()
A.足少阳胆经
B.足少阴肾经
C.足厥阴肝经
D.足太阴脾经
E.足阳明胃经
参考答案：A
甲、乙两个盒子里各放有标号为1，2，3，4的四个大小形状完全相同的小球，从甲盒中任取一小球，记下号码x后放入乙盒，再从乙盒中任取一小球，记下号码y．
（Ⅰ）求y=2的概率；
（Ⅱ）设随机变量X=|x-y|，求随机变量X的分布列及数学期望．
-Do you know who bought this e-dictionary him?
-I think his father . [ ]
A. for; did
B. for; bought
C. to; did
D. to; bought
