青霉素在稀酸溶液中(pH=4.0)和室温条件下的不稳定产物是( )。
A. 6-氨基青霉烷酸
B. 青霉醛酸
C. 青霉酸
D. 青霉醛
E. 青霉二酸
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The main purpose for applying the patent is to ______.
A. to make profit for biotech company
B. to repay the personal debt
C. to make the research possible to last 17 years
D. to make their research legal
Senator Robert Dole Criticized Time Warn for ______.
A. its raising of the corporate stock price
B. its self-examination of soul
C. its neglect of social responsibility
D. its emphasis on creative freedom
某公司要买100本便笺纸和100支胶棒，附近有两家超市，A超市的便笺纸0.8元一本；胶棒2元一支，且买2送1。B超市的便笺纸1元一本，且买3送1，而胶棒1.5元一支，如果公司采购员要在这两家超市买这些物品，则他至少要花多少元钱（）
A. 183.5
B. 208.5
C. 225
D. 230
______ is not written by William Butler Yeats.
A. The Lake Isle of Innisfree
B. Sailing to Byzantium
C. When You Are Old
D. Song of Myself
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