男，19岁。春季常突然发作呼吸困难，经咳嗽，咳出白色粘痰后气促减轻。查体时不用听诊器亦可听及的音是 （）

A.鼾音

B.羊鸣音

C.哨笛音

D.喘鸣音

E.痰鸣音

An analyst does research about discretionary fiscal policy. Challenges to implementing a discretionary fiscal stimulus in a timely manner are least likely to include that:

A. govemments discuss, vote on, and enact fiscal policy changes.
B. policy-makers recognize the nature and extent of the economic problems precisely.
C. government expenditures on unemployment insurance payments will increase during a recession.