十二经脉的命名主要结合了哪几个方面的内容
A.阴阳、五行、脏腑
B.五行、手足、阴阳
C.脏腑、手足、五行
D.手足、阴阳、脏腑
E.以上均不是
参考答案:E
—Who's that under the tree? Is it Jenny?
—It _______ be Jenny. She's ill in hospital today. [ ]
A. can't
B. must
C. may
D. mustn't
一个圆柱和一个圆锥,它们底面半径的比是1:3,高的比是3:1,那么它们的体积比是______.