But two hurdles stand in the way of Russia’s realizing its space dreams: a collapsing public-education system and a brain drain

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问题 But two hurdles stand in the way of Russia’s realizing its space dreams: a collapsing public-education system and a brain drain that for decades has been siphoning off the country’s highly trained engineers as they move to better-paying jobs in the West.

选项 A、obstacles
B、prophecies
C、hassles
D、outcomes

答案A

解析 A项意为“障碍”；B项意为“预言”；C项意为“激战”；D项意为“结果”。句子中画线单词hurdles意为“篱笆，障碍”，因此，A选项符合题意。

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But two hurdles stand in the way of Russia’s realizing its space dreams: a collapsing public-education system and a brain drain

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