阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Flights coming from the US to Europe normally benefit 41.______ the powerful winds from the jet stream, 42.______ can boost speeds by up to 300 km/h. But a new study says that advantage will 43.______ (weaken) with a continuing rise in emissions of CO2.
Climate change could increase the jet stream wind by 15 per cent. Flights from New York would speed up. But journeys from London would be 44.______ (two) as likely to take seven hours. The overall result is that round trips would get 45.______ (significant) longer with planes spending 46.______ extra 2,000 hours in the air, costing around $22 million every year.
While the study only looked at flights between Europe 47.______ the US, the authors believe the same impact is likely 48.______ (see) in other places as well.
And with the temperature being higher and higher due to global warming, 49.______ (fly) to the US could be longer and 50.______ (expensive). Therefore, airlines seek to make up for their costs through higher ticket prices.
41. _______________
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