[单项选择]建设项目建设需要进行多个厂址的比选，应从( )角度推荐最佳厂址方案。
A. 资源利用
B. 环境保护
C. 地质环境
D. 生态影响

{{B}} Trade Unions{{/B}}
1 Some scholars have associated trade unions with the medieval craft guilds(中世纪的行会), but there are important differences between the two. The guild members were master craftsmen who owned capital and often employed workers. Unions are known as associations of workers with similar skills.
2 In the past, individual workers had no control over the conditions of their working lives; political and economic power was concentrated in the hands of wealthy business owners. Workers found, however, that there was strength in uniting. From their earliest years, union objectives have been higher wages and improved working conditions.
3 Employers resisted, of course. They made great efforts to stop union organizing its activities. Union members were fired, workers were forced to sign