下列说法正确的是( )①教科书是长方形;②教科书是长方体,也是棱柱;③教科书的封面是长方形.
A:①②
B:①③
C:②③
D:①②③
The boy is ___________ smart ___________ everybody(人人;每个人)likes him.
忽必烈即位后诏令天下:“国以民为本,民以衣食为本,衣食以农桑为本。”这一方针标志着蒙古汗国国策发生重大转折,主要逐渐转变为( )
—I'll go to the country to enjoy the fresh ____ (空气) and clear streams.