题干

有研究者认为,近代中国出现过五次大的留学热潮。①②③处的初衷应该是(    )

批次

留学时间

留学初衷

第一次

晚清的留学热潮

第二次

民国初期的留学热潮

实业救国

第三次

国民政府时期的留学热潮

科技救国

第四次

新中国成立初期的留学热潮

第五次

改革开放以后的留学热潮

A:富国强兵、建设国家、创业立业

B:建设国家、实业救国、富国强兵

C:实业救国、创业立业、建设国家

D:富国强兵、实业救国、创业立业

上一题 下一题 0.0难度 选择题 更新时间:2019-06-08 09:08:36

答案(点此获取答案解析)

A

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    Five meteorologists (气象学家) who were trapped for two weeks after polar bears surrounded their weather station are now able to leave after the creatures were chased away. Their supervisor told NBC News early Wednesday.

    Russian officials had feared the siege could last for another month, the time it would take to reach the islands in the Kara Sea, high in the Arctic Circle. But on Tuesday night a research ship took a detour (绕道) to assist those weathermen, station supervisor Vasily Shevchenko told NBC News. The ship run by Russia's state-run oil firm Rosneft frightened away the bears using its helicopter, before resupplying the weather station with more food and puppies (幼犬) . The puppies are not yet big enough to deter the bears, but the station is planning to draft in a replacement adult guard dog as soon as possible.

    Some of the bears had taken to sleeping directly outside the windows of remote outpost. There was no risk of the researchers starving because they had a year's worth of food, but they were forced to take dangerous trips to a nearby building, holding a gun for protection, according to Shevchenko.

    Polar bears are an endangered species. In Russia, it's a crime to shoot them unless in self-defense. The bears usually leave the islands in the summer, but this time they were trapped by the melting ice, an apparent sign of climate change, according to Shevchenko. “They've stayed on the island because there is nowhere for them to go,” he said.

    The animals suffer from global warming because it shrinks the floating ice that forms their main hunting ground. According to the environmental group the World Wide Fund for Nature, known as the WWF, this has got some polar bears to go near human habitats in search of food.