Experts say it is an international trend to MP2.5 to check air quality.A. adaptB. attachC

问题补充：

Experts say it is an international trend to MP2.5 to check air quality.

A. adapt

B. attach

C. adopt

D. adjust

答案：

A. adapt

B. attach

(答案→)C. adopt

D. adjust

解析：本题考查动词词义辨析。adapt适应，改编，attach附加，adopt采纳，收养，adjust调节，句意：专家们说采用MP2.5检查空气质量是国际趋势。根据语境应选C。