写反义词。
聚精会神—____ 进步—____ 高明—____ 满意—____
如图,用12块相同的小长方形瓷砖拼成一个大的长方形,则每个小长方形瓷砖的面积是( )
What kind of structure is the sentence “The girl showed her classmates some of her family photos.”?
一辆自行车原价450元,现在只花了九成的钱。现价比原价便宜了( )元。