题目内容

Taiji Quan is beneficial to humans in many ways, so it is not important to take some precautions for a safe practice.

A. 对
B. 错

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更多问题

The group activities of Taiji Quan make it harder for practitioners to enhance mutual understanding

A. 对
B. 错

4-2-空气质量指数在多少范围内为优？

A. 0-50
B. 0-55
C. 0-60
D. 0-100

4-2-中国是世界上第一大排放国？

A. CO2
B. SO2
CO
D. H2S

空气质量的六个等级包括：_、_、__、_、_、__。