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材料是时代进步的重要标志，有机合成材料的出现更是材料发展史上的一次重大突破。下面有关材料说法正确的是

A．合金、合成纤维都是有机合成材料

B．水泥、玻璃钢、汽车轮胎都是常见的复合材料

C．合成材料的大量使用给人类带来了严重污染，所以要禁止生产和使用

D．开发使用可降解塑料能有效解决“白色污染”问题