永明文学的时间断限
参考答案:
永明文学是指上自刘宋泰始二年,下至梁武帝天监十二年这一时期的文学活动,而以齐永明年间为中心。
--What ____________when I phoned you?
----I_____________and began to have a bath.
A.had you done; finished
B.were you doing; had just finished
C.did you do; had just finished
D.were you doing; was finishing
造纸植物纤维的主要化学成分是:()
A.半纤维素
B.纤维素
C.淀粉纤维素
D.细菌纤维素
E.木素