读“长江、黄河水系图”，回答问题．
《李凭箜篌引》诗题中的“引”是____，篇幅较长，音节、格律一般比较自由，形式有五言、七言、杂言。
选择句子补全对话。
A. Is it green? B. What do you see? C. What colouris it? D. Good morning, Alice.
Danny: ____
Alice: Good morning, Danny.
Alice: I see a bird.
Alice: No, it isn't.
Alice: It's red.
