天麻块茎中维管束为（）
A.外韧型
B.周韧型
C.双韧型
D.周木型
E.辐射型
参考答案：B
The old lady, ____ had been killed in the war, was given help by the local government.
A．all her children
B．whose all children
C．all of her children
D．all of whose children
凯恩斯学派主张传导过程中的主要机制或主要环节是 ( )
A．货币需求量
B．汇率
C．货币供应量
D．利率
