黄帝之后过了很久，尧、舜、禹先后成为____的部落联盟首领。
⑴Do you want some rice?____ A. Thanks.
⑵What do you want to drink?____ B. Yes, I do.
⑶Can I help you? ____ C. I want some bread.
⑷Here you are.____ D. Water, please.
⑸Do you want coffee or tea?____ E. I want some tea, please.
He is reading a book ____（关于）China.
已知α是锐角且tanα=34，则sinα+cosα=____
