第212页

信息发布者：
C
serious
produces/causes
separate
carelessly
reduce
helping
will be punished
richest
digging
to study
will be used 
to build/for building
drive (cars) to work/ go to work by car
produce/cause/lead to serious air pollution
take some simple steps to make a 
big/great difference to
depend on nature's rich resources to live
Cutting down trees is not allowed/It's not allowed to cut down trees
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