A: Susan, did you hear the news? B: No, I didn’t. What was ____1____.

填入一个适当的单词补全对话，每空一词。

A: Susan, did you hear the news?

B: No, I didn’t. What was ____1____.

A: Some scientists found something ___2___.

B: What did they find?

A: They ___3___ a new kind of bird. They think that it first ___4___ one million years ago.

B: Really? How interesting! Can you tell me ___5___?