山西芮城永乐宫建于（）代，其中主要建筑三清殿面阔七间，屋顶形式为庑殿顶。
参考答案：元
被减数、减数与差的和是10.8，已知减数是差的80%，减数是______．
给下列句子排序。
( ) One, two, three, pull! They can't pull it up.
( ) What a big turnip!
( ) Come on, my friends. Please help me.
( ) Hooray!
( ) Let me help you!
( ) Oh, I can't pull it up.
