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6.Libraries should _________(实现提供资讯,启发读者的功能)

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Part II Writing ?xml:namespace>Directions: Write a paragraph on the following topic. The topic has an outline you can followWrite an essay entitled “A Great Hero in My Mind” by following the writing pattern of the text. You may apply as many expressions from the text as possible to your writing.Beginning part: Thesis Statement and Question1. Who is the great hero in your mind;2. A question related to the topic;Body part: ExamplesA few inspiring stories to illustrate your point;Concluding part1. Restatement of the main idea;2. The benefit you get from the heroic stories;3. Your wish to become a hero like him or her.

入射光为二、四象限线偏振光，经过一个四分之一波片，则出射光应为。

A. 一、三象限线偏振光
B. 二、四象限线偏振光
C. 正椭圆偏振光

入射光为左旋圆偏振光，经过一个半波片，则出射光应为。

A. 左旋椭圆偏振光
B. 右旋椭圆偏振光
C. 左旋圆偏振光
D. 右旋圆偏振光

在一束光传播的路径上，放置一个四分之一波晶片，在其后再放置一个偏振片，偏振片绕传播方向转动一周，观察到消光现象，则可以判断入射光应为。

A. 部分偏振光
B. 椭圆偏振光
C. 圆偏振光
D. 自然光