直接促使康有为、梁启超举行“公车上书”的主要原因是 [ ]
A、光绪帝颁布诏书
B、德国强占胶州湾
C、《马关条约》的签订
D、慈禧太后发动 * *
答案:C
—Did you watch the film Frozen on the Internet yesterday?
— No, I _______my mother do housework all day.
A.was helping
B.would help
C.had helped
D.help
TLC法中常用的吸附剂是( )
A.硅氧烷 B.硅胶 C.硅藻土 D.聚二醇 E.CMC