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prob le m is ver y serio us .Pe ople in the world a re thi nkin g m or e ab out how to l ook after the en vir on m ent. Wh en people wear gr ee n cl oth es , t hey w il l keep the en vir on m ent in their hea rts an d try to m ake th e e nv i r on m ent b et te r . Y el low will be ano t her popul ar col or . Wh y will it be popula r ? P eo ple a re ver y busy thes e days beca us e they hav e a l ot to do. Y el lo w is a s of t c ol or an d it can m ake p e ople f eel r el axe d. Most pe op le t hink blac k wil l be the m os t popula r col or .I t al ways lo oks coo l , a nd m e n oft en s how _ of f their s ocial po sit ions ( 社會地位 ) by us i ng t his colo r . ( ) op le thin k blue m eans ______ __. A . natur e B . war s C .