In wet areas of the world, the gain from trees absorbing carbon dioxide above ground seems to be outweighed(超过) by the loss of carbon from the soil below ground. Countries that plan to combat global warming by planting trees may have to think again.

　　Solutions to environmental problems are often more complex than they first appear, and understanding the Earth’s climate is a very great challenge.

　　63．People usually hold the opinion that

　　.

　　A．huge dust storms can destroy carbon dioxide

　　B．huge dust storms can destroy the oceans on the earth

　　C．huge dust storms can’t do anything beneficial for man

　　D．planting trees is the only way to control huge dust storms

　　64．Andy Ridgwell, the environmental scientist, believes that

　　.

　　A．dust plays a more important part than trees

　　B．trees should’t have been planted in dry places

　　C．carbon dioxide is harmful to everything on the earth

　　D．environmental problems are more complex than expected

　　65．Robert Jackson’s experiment proves that

　　.

　　A．grassland areas should be covered by forests

　　B．trees hold more carbon than grasses

　　C．carbon can turn grass into dust

　　D．less carbon can make trees grow faster

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