没有提及的英文

a 和 an 都是一个/只/件 的意思. an 是用在所用响音开始的名词,那便是 :A,E,I,O,U. 例:an apple；an elephant；an orange；an ugly duckling(丑天鹅)；an unusual situation (一个不寻常的情形). 不是响音开始的则用 "a" 如 :a man；a pen；a car 等等. 用法: An elephant is large than an orange.一只大象比一只橙大. That unusual situation is now under controlled.那不寻常的事态已受控制. She was seen as an ugly duckling when she was little.她小的时候被视为一只丑天鹅. An angle of 90 degrees is a straight angle.一个90度的角是个直角.(这个例很重要,例中的两个"angle"一个用"an"一个则用"a".你研究一下便会明白"a"和"an"的用法了) 至於"the "的用法如楼上: I use to have a dog.The dog liked eating and grew so big. I walked to school every morning.The school is very far away from my home. I have a television in my bed room.The television is quite small.

是skimming and scanning里的吗？就是文中没提到的意思，Not Given.

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