—Wow. What a beautiful coat!

—I bought it in Suzhou last year. It's _____ silk. It's dear. [ ]

A. made of

B. made from

C. made in

D. made by

日本成为世界上的经济强国，主要不是依靠（  ）

A．矿产资源丰富

B．岛国有优良港湾的优势

C．大力发展科学技术

D．有丰富的劳动力资源