支气管哮喘发作时可出现下列哪些临床表现()
A.强迫端坐位呼吸
B.呼吸动度增大、呈吸气位
C.出现严重呼气性呼吸
D.语音震颤增强
E.大汗淋漓伴发绀
参考答案:A, C, E
— Allan looks tired out.
— Sure. He _______ in the gym for two hours. [ ]
A. works out
B. had worked out
C. has been working out
D. was working out
我们应该培养儿童兴趣的哪些品质?