《 * * 党宣言》发表的标志是：

A．巴黎公社成立

B．马克思主义诞生

C．“ * * 主义者同盟”成立

D．“全国 * * 协会”建立

Daylight saving time was instituted to increase productivity.()

A. reorganized

B. started

C. encouraged

D. taught