题目内容

58（）

A. discovered
B. acted
C. invented
D. designed

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Fires need oxygen(氧气). Without oxygen they will die. Cover a fire with water, sand, or sometimes with your coat. (Passage 3 )

66（）

A. concerned
B. itself
C. available
D. oneself

56（）

A. By
B. At
C. In
D. On

The best title for the passage may be （）

A. Garbage and the Earth
B. Fossil Fuel and Carbage
C. Land and Garbage
D. Garbage—Energy Source