水溶性薄膜衣料是（）
A.卵磷脂
B.单硬脂酸丙二酯
C.黄原胶
D.聚山梨酯60
E.聚乙二醇
参考答案：E
These football players were not specially ___ until they joined our club．
A．educated
B．exercised
C．practiced
D．trained．
只有当现货价格明显高于期货价格时，才可进行期现套利。( )
