第24题: [单项选择]As soon as person gets "threshold pains", he should _______. A. telephone the doctor immediately B. first relieve the stress and tension which cause the pains C. wait to let the pains reach a certain point D. take pain-killer 参考答案:B 答案解析:细节题。根据最后一段中的“when they (threshold pains) occur, he or she does something about relieving the stress