Each year thousands of____ (explore) and tourists visit the polar regions of the Arctic and Antarctica. But the increasing number of people travelling to the ends of the Earth' can have a negative effect____ fragile ecosystems. Should tourists____(allow) to visit polar regions?

    About 40,000 tourists visit Antarctica each year, More than five million travel to the Arctic and sub-Arctic. Transporting tourists to the regions ____(increase) ship and airplane traffic, adding to the risk of pollution, oil spills, and other ____(environment) damage. Because the places where wildlife is accessible ____(be) few in numbers, tourist traffic can become concentrated in specific areas,____ (put) Arctic vegetation at risk.

    Others say that access____ these very special parts of the world should not be restricted to only researches and scientist. Polar tourism allows people to develop deep personal connections with polar regions. “Those ____travel to the Arctic or Antarctica often become cheer leaders for supporting those places” Jim Sano, vice president for travel and____(conserve) at World Wildlife Fund, told TFK.

阅读教科书及相关历史材料，运用时序与地域、原因与结果、延续与变迁等概念，在探究过程中反思历史，是历史学习的基本途径之一。根据提示，完成探究活动。

材料一：大西洋沿岸部分国家（地区）在世界工业产量中的比重（出自《大国的兴衰》）

材料二：到1995年，美国的生产总值占了全球的一半，而它的人口总数却只占全球的6%。——《美国史》

材料三：冷战进程中，美国先后发动了朝鲜战争和越南战争，消耗了经济实力。……正是美国在朝鲜战争中的“特需”将日本从萧条中拯救出来。——《战争与世界经济重心的转移》

尊重他人隐私，首先表现在不经本人允许，不得散布他人隐私。