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根据下面内容，回答题： 在清理化合物样品库的过程中发现有4瓶样品的标签模糊不清，无法辨别其化学成分名称。通过翻查实验记录发现，化合物1为从某药材的挥发油中通过冷冻析晶的方法制备得到。化合物2具有明显的抗疟活性，且其具有较好的油溶性。化合物3为以穿心莲内酯为原料通过结构改造制备得到，且具有较好的水溶性。化合物4为中药的指标性成分。 化合物l为以下哪个化学成分 查看材料A.
银杏内酯
B.
二氢青蒿素
C.
穿心莲内酯磺酸钠
D.
桉油精
E.
薄荷脑
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举一反三
【单选题】At the Beijing Olympics, Bolt broke the 100-meter and 200-records and became the _____man in the world.
A.
fastest
B.
heaviest
C.
tallest
D.
slowest
【单选题】The mayor of Beijing says that all construction work for the Beijing Olympics _____ by 2006.
A.
has been completed
B.
has completed
C.
will have been completed
D.
will have completed
【单选题】Beijing National Stadium,the showpiece of the Beijing Olympics,has fallen into disuse since the end of the games, it difficult to make a profit. [ ]
A.
make
B.
to make
C.
making
D.
made
【单选题】Lin Dan won the first prize in the Beijing Olympics, which helped him gain the ____ of the world.
A.
congratulation
B.
appreciation
C.
admiration
D.
administration
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