题目内容：
WhatwastheachievementoftheEUproject? A．Itfoundotherchemicalmechanismsplayedacriticalrole.
B．Itfoundthedestructioncausedbychlorineplayedacriticalrole.
C．Itsuccessfullyhelpedreducetheemissionofchlorine,
D．Itsuccessfullyansweredalltheunsolvedquestionsaboutozoneloss.
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：