s mainly about

　　.

　　A.why paving roads reduces our water

　　B.how much we depend on water to live

　　C.why droughts occur more in dry climates

　　D.how human activity affects our water supply

　　解析　主旨大意题。根据对文章的整体理解可知文章主要讲述了人类活动对淡水供D符合文意。其他各项都是对文章的部分描述而不是文章的主旨故可排除。

　　答案　D

　　Passage 19　(2017·湖南)

　　话题：代替塑料的环保品

　　词数：276

　　low－cost(可生物降解的) material inspired by insects' hard outer shells.The material's inventors say it has a number of possible uses and someday could provide a more environmentally friendly alternative to plastic.The material(虾) shells and proteins produced from silk

　　A major benefit of the material is its biodegradability.Plastic's toughness and flexibility represented a revolution in materials science during the 1950s and 60s.Decades later，however，plastic's very durability(耐用性) is raising questions －time products such as plastic bagslived consumer goods，used in the home for a few years and then cast into a landfill where they will degrade for centuries.What is the point of making something that lasts 1，000 years?

　　Shrilk not only will degrade in a landfill, but its basic components are used as fertilizer (肥料),

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