从上面看立体图形 ,看到的图形是( )。
A:
B:
C:
——What do you think of Tom?——He is ________ honest boy. He can play ________ piano very well.
____that ____English?
现有下列三种物质,请根据要求回答有关内容.
物质
化学方程式
简述
水
____
说明:水由氢元素和氧元素组成
酒精
C2H5OH+3O22CO2+3H2O
用途: ____
二氧化锰
二氧化锰作催化剂,分解反应
He turned from side to side, eyeing himself in the mirror with a serious, studied ______ that soon changed into a smile.