△=25
○=12
□=96
●=48
△+○=____
●-○=____
○+●=____
□-○=____
□-△=____
△+●=____
●-△=____
△+△=____
“水上大世界,动物添精彩”,下列生活在水中,用鳃呼吸、用鳍游泳的是( )
The ______ of two people is the one who was born first.
观察下表,按照西周宗法制的规定,有资格继承王位的是( )
关于变异的说法,不正确的是