线索1：定义
a. The harbor is protected by a jetty-a wall built out into the water.
b. Jane is indecisive, that is, she can’t make up her mind.
线索2：重述
a. He had a wan look. He was so pale and weak that we thought he was ill.
b. I am a resolute man. Once I set up a goal, I won’t give it up easily.
线索3：普遍知识
a. The door was so low that I hit my head on the lintel.
b. Mark got on the motorbike, I sat behind him on the pillion, and we roared off into the night.
线索4：相关信息
a. Just before the exam Carl’s hands shook and sweated so much that he could not hold a pen. His heart beat fast and his stomach ached, even though he knew the subject very well. He really had a strange phobia about taking tests.
线索5：例子
a. Select any of these periodicals: Time, Newsweek, Reader’s Digest or theNew Yorker.
b. She is studying glaucoma and other diseases of the eye.
线索6：比较
a. Jane was talking with others while Eliza remained reticent all the time.
线索7：比喻
a. The hot-air balloon took off. It was as buoyant in the air as a cork in water.
线索8：构词知识
un-, im-,-less, -ness, -ion, -ist
寻找主题句，掌握段落主要思想。(look for the topic sentence and master the main idea)
主题句的位置可以在句首，句中或句末。但在句首的比例通常达到50%-60%，句末是主题句的可能性为30%左右。
