题目

Millions of Americans sit behind a computer screen, chained to their desk all day because the vast majority of stable, high-paying professions are “office jobs”. However, having a successful career does not require you to sit behind a desk and plug away at a computer all day.In fact, there are a large number of non-desk jobs in a variety of industries that are growing and offering workers a direct path to the middle class, according to a new analysis of labor market information from CareerBuilder. While most of the highest-paying non-desk jobs are medical professions that require a doctora塑料制品在自然界中上百年都“顽固不化”，而造成严重的环境污染。因此，开发塑料的代用品及可降解塑料，成为科技界攻克这一难题的关键。 （1）“白色污染”通常是指 [     ]A．冶炼厂的白色烟尘 B．石灰窑的白色粉末 C．聚乙烯等塑料垃圾 D．白色建筑垃圾 （2）塑料的代用品选择科学合理的是 [     ]A．用木材或纤维素及淀粉开发的一次性餐盒、纸杯等 B．用金属制品全面取代塑料制品 C．用玻璃制品全面取代塑料制品D．全面封杀塑料制品 （3）目前能有效地减少“白色污染”的最佳方法是 [     ]A．掩埋处理 B．燃烧处理 C．用纸制包装用品代替部分塑料包装用品D．倒入江河湖海中