[知 识 梳 理]　　　　　　　　　　　　　　　　　　　　　　 观察感悟(源于教材) Ⅰ.复习同位语 1．The fact ________________________ was very encouraging. 2．Then came the disturbing news ____________________. 3．However，the problem __________________bothered scientists. 4．Scientists hold the belief________________________. 5．Besides that，there is also a fierce debate over the question______________.