我国的第一个环境标准是( )。
A.《工业“三废”排放试行标准》
B.《地面水环境质量标准》
C.《污水综合排放标准》
D.《工业企业设计卫生标准》
参考答案:A
Read and fill in the blanks. 请用所给词的适当形式填空。
1. The cow is walking ____ (slow).
2. Tom ____ his leg yesterday. (hurt)
3. These boys are____ loudly now. (talk)
4. I can't take a picture. It is____. (easy的反义词)
5. The ____ are buying storybooks. (child)
以下哪项不属于食管的生理性狭窄()
A.食管入口处
B.主动脉弓压迹
C.左主支气管压迹
D.左心房压迹
E.膈肌食管裂孔