Rivers are one of our most important natural resources(资源).
1个回答

小题1:D

小题2:C

小题3:D

小题4:C

小题5:A

小题1:根据文章内容The greatest of all for navigation（航海）, however, is the Amazon in Brazil（巴西）可知答案为D

小题2:根据文章内容可知答案为C

小题3:根据文章内容Then people can use the water not only to irrigate(灌溉) their fields but also to make electricity for their homes and industries.可知答案为D

小题4:根据文章内容the water in the rivers becomes polluted with chemicals and other materials.卡答案为C

小题5:根据文章内容大意可知答案为A

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