Conventional wisdom says trees are good for the environment. They absorb carbon dioxide -- a greenhouse gas -- from the atmosphere and store it as carbon while releasing oxygen. The roots of trees have been thought to trap sediments and nutrients in the soil, keeping nearby rivers free flowing . Trees have also been credited with steadying the flow of these rivers, keeping it relatively constant through wet and dry seasons, thus preventing both drought and flooding. Pernicious nonsense, conclude two pieces of research published this week.
The first, a four-year international study led by researchers at the University of Newcastle, in Britain, and the Free University of Amsterdam, identifies several myths about the link between forests and water. For example, in arid and semi-arid areas, trees consume far more water than they trap. And it is not the trees that catch sediment and nutrients, and steady the flow of the rivers, but the fact that the soil has not been compresse
A. can improve the quality of atmosphere.
B. may lead to slow flowing of rivers.
C. will help wet and dry seasons to be unchanged.
D. are able to remove carbon from the soil.
Directions:
Title: How to Make a Good Speech in English
Outline:
1. The importance of speaking English well is known to all.
2. The chief thing about speaking in English is to be brave to speak it.
3. Sum up your points of view.
You should write about 160-200 words neatly on ANSWER SHEET 2.
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