B．flying

　　C．catching

　　D．boarding

　　33．A.expression

　　B．idea

　　C．thought

　　D．impression

　　34．A.honesty

　　B．lies

　　C．goods

　　D．things

　　35．A.remember

　　B．learn

　　C．revise

　　D．read

　　Ⅲ.阅读理解

　　There are several advantages in planting trees: they firm the soil, soak(渗透) up extra water and take carbon dioxide out of the atmosphere.However, it now turns out that planting trees could add to global warming.We all know that tree roots do a great job of keeping soil firmly on the ground and out of the wind's power.The problem is that some of the dust clouds play an important part in soaking up carbon dioxide.

　　Huge dust storms blow out over the oceans from dry parts of North Africa and Central Asia.Tons of dust are lifted and left as a thin film over the ocean surface.

　　Dust from China is carried east and left in the Pacific Ocean.If a treeplanting programme there is successful and the dust supply reduced, the net result may be that less carbon dioxide gets locked away in the ocean.

　　Andy, an environmental scientist has spent the past few years studying dust and says his work shows clearly the complexity of the system.For this reason the need is to focus on cutting carbon dioxide giving off rather than doing anything else.

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