如图所示为“一个世纪以来人类能源消耗”图象,针对这种趋势,我们应该____ . 目前我国常用的能源有煤炭、石油、天然气、风能、水能、核燃料、太阳能等,其中属于可再生能源的是____ .
正值青春期的未成年学生,容易受到溺水、烧伤、交通事故、被勒索等伤害。避免这些伤害,最有效的对策是( )
─ Mrs. Zhang was sent to teach English in a poor mountain village last year.
─ She said she would never forget some pleasant ______ while working there.
如果执行程序框图,那么输出的S等于 ( )