单选题 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.
A. obstacles B. prophecies C. hassles D. outcomes

【正确答案】 A

【答案解析】[解析] 画线单词hurdles意为“篱笆，障碍”。A项意为“障碍”；B项意为“预言”；C项意为“激战”；D项意为“结果”。因此，A选项符合题意。