rare adj. 稀少的；罕有的；珍贵的

　　a rare event 罕见的事件

　　a rare book 珍贵的书

　　rare air 稀薄的空气

　　①He has become ill because he rarely takes exercise.他病了，因为他很少锻炼。

　　②This species of plant is becoming increasingly (rarely)because of climate changes.

　　因为天气变化这种植物正在变得越来越稀少。

　　【答案】　②rare

　　[名师点津]　

　　rarely位于句首时，句子要部分倒装，有类似用法的否定副词还有never, little, seldom, hardly等。

　　③Rarely have I seen such a beautiful sunset.

　　我很少见到这么美的日落。

　　 fit adj.健康的；强健的；胜任的 v．适合；合身

　　(教材P1)I'm quite fit.我相当健康。

　　(1)be fit for 适合；胜任

　　be fit to do 适合做......

　　keep/stay fit 保持健康

　　(2) fit in with 与......相适应；与......相协调

　　①He runs three miles every morning. That's why he is so fit.

　　他每天早晨跑3英里。那是他如此健康的原因。

　　②These shoes are a bit small. They are not fit me.

　　这双鞋有点小。不适合我。

③I don't think she is fit (look) after the children because she is too young.