A cooperative program between China and Germany on building Yangzhow, a famous ancient city, into a(n) city has proceeded smoothly since it started in September last year. A. ecology-friendl
A cooperative program between China and Germany on building Yangzhow, a famous ancient city, into a(n) ________ city has proceeded smoothly since it started in September last year.
A. ecology-friendly
B. friendly ecology
C. friendly-ecological
D. ecological-friendly