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减少；减轻
sand
sandstorm
change into
desert
human being
although
reduce
They do harm to our health in many ways .
air pollution
light pollution
litter
water pollution
soil pollution
noise pollution
sandstorms
Do you know how sandstorms come into being?
The boy and girls are
talking about ________.
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities
1b Listen to 1a and choose the best answer.
Focus on the main idea of the conversation when you listen for the first time.
B
1. The weather is fine and the wind is blowing
lightly. ( )
2. A lot of rich land has changed into desert
because people have cut down too many trees.
( )