Physics ______ much harder than English, I think. [ ]
A. are
B. is
C. was
D. were
答案:B
简述货物包装和标志的主要作用?
在洗涤奶嘴时,一般用()来擦洗奶嘴的里面。
A.醋
B.茶叶
C.洗涤灵
D.盐