一 Mary seems relaxed during the interview.
— Yeah. She's always so confident.
A:not calm
B:not worried
C:not young
把560缩小10倍是____,缩小100倍是____,缩小1000倍是____。
早、中、晚三餐摄取的能量比例最好是( )
下列四种能源中属于二次能源的是( )