=660÷2
=330(套)
答:现在可以做330套。
People are destroying their best fighters _____ pollution.
目前已知的动物大约有____ 种,这些动物按照身体内有无脊椎骨组成的脊柱可以分为____ 和____ 两大类。
—One. They two in the future, I guess.