If the pressure is not ______ at once, there may be an explosion.A、relievedB、re

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问题 If the pressure is not ______ at once, there may be an explosion.

选项 A、relieved
B、retreated
C、released
D、revealed

答案 C

解析动词辨义。relieve意为“减轻，缓解”，可指肉体上的疼痛等各种症状的减轻、缓解，也可指精神上的痛苦、忧愁的解除，但并不含有根本上、永久性地免除的意思，如：a drug that relieves headaches(缓解头痛的药)；retreat意为“撤退，退却”，如：Napoleon’s retreat from Moscow(拿破仑从莫斯科撤退)；release意为“释放，解放”，指从某种束缚或痛苦中解脱出来，如：Sometimes death can release a patient from suffering． (有时死亡能解除病人的痛苦。)reveal意为“显示，透露”，如：reveal a secret(揭露一个秘密)。根据题意可知，应选C)

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