实喘的原因是（）
A.风寒袭肺证
B.痰饮阻肺证
C.中气不足证
D.肺肾亏虚证
E.肾不纳气
参考答案：B
41. Mr. Smith is very kind-hearted and capable. You are really _______ in having such a good teacher.
A．sorry
B．sad
C．poor
D．Fortunate
何谓Rh血型？有何临床意义？
