小题1:It was “World Conservation Year”.
小题2:They hoped that people would do something quickly to conserve nature.
小题3:In 1850, about a third was covered by forests.
小题4:People have planted more and more trees on the hills.(言之有理即可)
小题5:It has been built to stop the sand from moving towards the rich farmland in the south.
小题1:根据第一段1970 was “World Conservation(保护) Year”.可知答:It was “World Conservation Year”.
小题2:根据第一段They hoped that people would do something quickly to conserve nature.可知答:They hoped that people would do something quickly to conserve nature.
小题3:根据第三段In 1850, about a third was covered by forests.联系前文,可知这指的是美国,故答:In 1850, about a third was covered by forests.
小题4:根据最后一段For example, people plant more and more trees on the hills.可知答:People have planted more and more trees on the hills.(言之有理即可)
小题5:根据最后一段In China, a new Great Wall has been built across the northern part of the country to stop the sand from moving towards the rich farmland in the south.描述,可知答:It has been built to stop the sand from moving towards the rich farmland in the south.