人体之气的生成来源有（）
A.先天之气
B.水谷之气
C.脏腑之气
D.清气
E.经络之气
参考答案：A, B, D
I don't think sixteen-year-olds should _____ to go to bars. [ ]
A. allow
B. allowing
C. be allowed
D. not allow
小儿肺炎喘嗽X线检查肺部可见（）
A.肺纹理增粗
B.肺纹理紊乱
C.斑片状阴影
D.透亮度降低
E.透亮度增强
