She likes volleyball, _____ she doesn't like playing it. [ ]
A. but
B. or
C. and
D. /
答案:A
使用硬水会给生活和生产带来许多麻烦.下列试剂能区分硬水和软水的是( )
A.食盐水
B.盐酸
C.硝酸钾
D.肥皂水
如何使用电函谈判?