有挥发性的香豆素的结构特点是游离呋喃香豆素类。()
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在同一层次的对应实体间交换的数据叫（）。
A. IDU
B. SAP
C. 用户数据
D. PDU
Which of the following can be the best title for the text？
A. The euro-zone economy
B. The euro-zone unemployment
C. The euro-zone low-inflation
D. The euro-zone recovery
Which of the following statements is true according to the opening paragraph？
A. Smokers have been prevented from quit smoking for years.
B. It is rare that smokers make a decision to quit.
C. It is preferable to abstain from smoking in groups.
D. Nonsmoker could be affected because of the ripple effects.
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