第七章 Oil and Gas

  课文理解；语言点讲解；练习；语法

特殊句式：
1) practice of “comparative and superlative adjectives”
2) the use of the past participles. For Example:
They sank to the floor of the seas, along with sand and mud brought by the rivers.
他们和河流带来的泥沙一起沉入海底。
语法:
Nonfinite Verbs & Gerund [非谓语动词-动名词]

    复述原文，掌握本章里出现所有语法现象，能熟练、正确使用常用词