She's upstairs ______ letters.
A. writes
B. is writing
C. write
D. writing
21（）
A. yesterday
B. tomorrow
C. before the day
D. the day before
Auld Lang Sync is（）
A. a Scottish song which says good-bye to old friends
B. a Scottish song that welcomes the coming of the new year
C. a song sung by the Scottish people only
D. a Scottish song remembering obi friends and good times
研究药物制剂的基本理论处方设计制备工艺质量控制与合理应用的综合性技术科学（）
A. 生物药剂学
B. 工业药剂学
C. 剂型
D. 临床药学
E. 药剂学
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