Passage Reading 段落朗读

Acid rain is a very serious air and water pollution problem. Many people feel that it is the most serious pollution problem that we now face. Scientists say that plant and animal life in thousands of lakes in the U.S. and Canada has already been destroyed by acid rain.

    Acid rain forms in the upper atmosphere. There sulfur dioxide and nitrogen oxides mix with water vapor to form sulfuric acid and nitric acid. When the vapor condenses and rain falls, the acid falls with it. Every time acid rain falls in a lake, the level of acid in the lake rises. Over time, the insects and fish die and the lake becomes a dead one.

    The problem of acid rain has greatly increased in the last few years. Most of the blame for acid rain has been placed on industries. However, some people feel that ineffective air pollution laws are also to blame for the acid rain problem.

权威名师解析：

注意atmosphere, sulfur/ sulfuric, dioxide, nitrogen, vapor, condense等生僻、难词的发音。

atmosphere     ['ætməsfiə]   （n） 大气层；气氛

sulfur         ['sʌlfə]    （n）硫

sulfuric        [sʌl'fjuərik]  （adj.） 硫磺的

dioxide         [dai'ɔksaid]   （n） 二氧化物

nitrogen        ['naitrədʒən]   （n） 氮

vapor          ['veipə]     （n） 蒸汽

condenses       [kən'dens]  (v) 浓缩；缩短

Free talk

Reading is more important a way to learn the world than travelling?

权威名师解析：（以赞同的角度为例）

1. learn the world from history  (depth: learn the history of the world, then have a better understanding of it)

1. learn the world from more aspects (wider range; from various viewpoints)　

2. learn the world by comparison