关汉卿用一种比较成熟的戏剧形式创作了悲剧作品《窦娥冤》。这种形式是（   ）

When I got to school, I realized I ______ my backpack at home.

阅读短文，判断正误。
    My name is Ada. I am a girl. I don't have a brother, but I have a little sister. Her name is Ann. She likes to read books. I like to play on the computer. We live in the same(同一的) bedroom. There are two beds, a desk, two chairs and a computer in our room.
    Our parents(父母) love us and we love them, too.

根据运算定律，在横线里填上适当的数。

a＋（30＋8）＝（____＋____）＋8

38＋28＋12＝____＋（28＋____）

45＋____＝32＋____  

二进制数110是二进制数11的（   ）