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
