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
A.A.telephone B.first C.wait D.take
【参考答案】
B 解析：细节题。根据最后一段中的“when they(threshold pains)occur；he or ......