如图是一把剪刀,其中∠1=40°,则∠2=____
— What is he doing?
— He ________ his MP4.
据《乐记·乐论》载:乐者天地之和也;礼者,天地之序也。和,故百物皆化;序,故群物皆别。乐由天作,礼以地制。过制则乱,过作则暴。明于天地,然后能兴礼乐也。该材料( )