题目

Medical teams were sent to the disaster area to care for ______ wounded at once.A.a B.an C.the D./ 答案：【答案】C【解析】句意：医疗队立即被派往灾区照顾伤员。考查定冠词。“the +形容词” 表示一类人或物；wounded受伤的，形容词，the wounded：伤员。故选C。1．下列各项关系互为同位素的是（　　）A．石墨和金刚石B．水和重水C．甲烷和丁烷D．氕和氚