维管束周木型及外韧型,含晶鞘纤维及油细胞的药材是()
A.甘草
B.石菖蒲
C.桔梗
D.黄芪
E.天麻
参考答案:B
Not only the workers but also the machine ____ not there.
A.are
B.were
C.is
D.has
The Senate won the vote by a large margin.