单选题 The policemen acted quickly because lives were at stake.

【正确答案】 B
【答案解析】“in danger”和“at stake”都有“在危急”之中的意思;in despair失望地,绝望地;in misery悲伤地;in pain痛苦地;[句意]警察行动迅速,因为生命危在旦夕。