【单选题】【消耗次数：1】
4.Scientists didn’t know much about lung cancer ______.
①
before long
②
until recently
③
long before
④
in the past few years
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相关题目
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This technology has been ?around for a long time, but not until recent years _______ it in marketing.
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businesses employed
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did businesses employ
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businesses had employed?
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had businesses employed
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It was quite a few years before Mark Twain finally finished his last novel.
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C．过了好几年，马克·吐温才终于完成最后一部小说。
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The prices of the agricultural products have been ____ steadily in the past few years.
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risen
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raised
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arisen
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have walked
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have learned
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I like it.
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You are wonderful.
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某市地铁工程施工作业面内，因大量水和流沙涌入，引起部分结构损坏及周边地区地面沉降，造成3栋建筑物严重倾斜，直接经济损失约合1.5亿元。根据《生产安全事故报告和调查处理条例》规定，该事故等级属于( )。
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特别重大事故
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重大事故
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较大事故
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一般事故
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项目负责人
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劳动安全培训制度
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劳动健康卫生制度
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劳动安全卫生制度
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劳动安全生产制度
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办公、作业区
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生活、作业区
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