Seeing the coach nodding ________ to her, the little dancer was no more nervous and went on with her performance

What’s wrong with Tom —— Bad luck! Tom his bike and hurt his leg.

Between 1950 and 1990, the world population doubled to 5.3 . Nearly eighty of these people live in developing, poorer nations.

填入下文横线上的文句，最恰当的一句是（ ）中国人对小说的欣赏习惯，讲究的是无巧不成书， ，也就是不喜欢一般化，而喜欢特殊化。

Jenny goes to school on foot．Ittakes her about half ____ hour to get there． A．an