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单选题
Industrial safety does not just happen. Companies with low accident rates plan their safety programs, work hard to organize them, and continue working to keep them _____ and active.
A
alive
B
vivid
C
mobile
D
diverse
参考答案
参考解析
解析：
句意：工业安全并不是偶然发生的。低事故率的公司计划并组织安全生产，然后继续保持这些安全措施的有效性和活跃性。keep sth. alive是固定词组，意思为“使……继续有效，使……继续发挥作用”。keep与vivid意为“生动的”。mobile移动的。diverse多种多样的。
句意：工业安全并不是偶然发生的。低事故率的公司计划并组织安全生产，然后继续保持这些安全措施的有效性和活跃性。keep sth. alive是固定词组，意思为“使……继续有效，使……继续发挥作用”。keep与vivid意为“生动的”。mobile移动的。diverse多种多样的。
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