请你用英语描述你同桌的衣着。
This is ……. He/ She……. Her/ His name is……. She/ He is……years old. Look, he's/she's is wearing…….
This is my classmate. She is a beautiful girl. Her name is Ann. She is seven years old. Look, she is wearing a red dress.
在括号中填上合适的词语。
____的掌声 ____的声音 ____的节日 ____的人群
____的队员 ____的检阅 ____的队伍 ____的儿童
直线x-y=2被圆(x-4)2+y2=4所截得的弦长为( )
已知:2Na2S2O3+I2→Na2S4O6+2NaI
完成下列填空: