含糖分和黏液质多而贮于通风干燥处的品种是（）
A.天冬
B.党参
C.熟地
D.玉竹
E.肉苁蓉
参考答案：A, B, C, D, E
Mr. Black was so____ to his research that he seldom cared about what happened around him.
A．devoted
B．concerned
C．absorbed
D．used
列车的行驶速度：运爆破材料或大型材料时，不得超过（）m/s。
A.1.5
B.2
C.3
D.4
