5．Heavy downpours last month in Rhode Island led to widespread flooding，causing millions of dollars in property damage and leaving thousands homeless．The flood waters also poured vast amounts of raw sewage（未经净化的污水） into the rivers and streams that flow into Narragansett Bay．
It sounds like the makings of an environmental nightmare．But in fact it's just the opposite．To scientists'delight．The sewage-loaded floodwaters have caused a well-timed growth of phytoplankton．The microscopic creatures that form the foundation of marine（海洋的） food chains．With more food available for fish．Clams and other sea creatures．The bay's fisheries industry is expected to benefit．
In decades past．Narragansett Bay typically experienced a late winter early spring algal（海藻） bloom that fed creatures up and down the water column．But in recent years，the waters of Narragansen Bay warmed greatly，meriting this seasonal event．
Mark Berman，an oceanographer with the Nationa．Marine Fishertes Service．Said the flood seemed to have sent the bay back in its normal state．
However，local，mutate and federal officials in Rhode Island leave been batting other algal blooms that，by contrast，are causing widespread harm to the Narragansett Bay ecosystem．During summer months，sewage and agricultural runnel flows into the bay．Causing large blooms．But inseam of becoming food for sea creatures，much of the phytoplankton is consumed by bacteria，which grow last in the warmer waters．The rapid bacteria growth leads to hypoxia decrease of oxygen in the water that can cause large fish tools．One such die-off occurred in 2003．when millions of oxygen-starved fish washed up on the belches of Narragansett Bay．
The flood's positive impact will probably be a one-time event，Mr Berman said．Mcanwhile efforts to curb the harmful summer honors continue； in 2003．for instance，Providence completed a﹩359million sewage tonal under the city designated to reduce the polluted storm overflow into Narragansett Bay．
71．Scientists believe that the row sewage flowing into the bay willC．
A．pollute the island's environ mean
B．cause lots of property damage
C．increase the fisheries production
D．destroy the food chains in the bay
72．The potential benefit of fisherics industry rclics on theB．
A．warm temperatures of the bay．
B．growth of phytoplankton
C．large summer alga blooms
D．consumption of oxygen by beaters
73．People struggle against the summer blooms because they willC．
A．pollute the local natural environment
B．increase the prcducmon of fishery industry
C．cause large fish kills of the bay indirectly
D．provide too much food ior sea creatures
74．It can be inferred thatD．
A．money spent on the summer blooms has been wasted
B．the government is inverting to promote the local fisheries
C．research of accanology should he encouraged
D．she raw sewage impacts are currently con radiator
75．The underlined word"curb"the last postage can be defined as"A"．
A．control B．consume
C．cause D．cure．
分析 本文讲述排污水流入海湾会导致环境的破坏，可是反过来它对于渔业的生产也是有好处的，因此科学家对排污水流入海湾的观点有所争议．
解答 71-75CBCDA
71．C 细节理解题．由第二段"a…have caused a welltimed growth of phytoplankton，the microscopic creatures that form the foundation of marine（海洋的） food chains．"可知排污水流入海湾造成浮游植物的生长，微观生物形成海洋食物链的基础，会提高渔业生产．故选C．
72 B 细节理解题．由第五段The rapid bacteria growth leads to hypoxia decrease of oxygen in the water that can cause large fish tools．可知浮游植物的增长可以导致大的鱼群，故选B．
73 C 推理判断题．由B项最后一段可知，政府投资的目的是to reduce the polluted storm overflow into Narragansett Bay，C项应该是more researlogy should be encouraged．故选C．
74 D 从第二段和第五段中科学家的不同观点看出opinions on the raw sewage impact are currently contradictory科学家们对排污水流入海湾的观点是矛盾的．故选D．
75 A 词义猜测题．根据最后一段Mcanwhile efforts to curb the harmful summer honors continue可知还没完全处理好，没有治愈，所以应是控制control．故选A．
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