在霉菌与害虫繁殖生长的旺季,对饮片的养护宜采用()
A.通风养护法
B.密封养护法
C.高温养护法
D.清洁养护法
E.对抗贮存法
参考答案:B
2008年5月12日,四川省汶川县发生了里氏8.0级大地震,兰州某中学师生自愿捐款,已知第一天捐款4800元,第二天捐款6000元,第二天捐款人数比第一天捐款人数多50人,且两天人均捐款数相等,那么两天共参加捐款的有( ),人均捐款( ).
—John, what was your sister doing while you _____ the piano?
—Oh, she _____ with toys.[ ]
A. played; played
B. played; was playing
C. were playing; played
D. were playing; was playing