第20题: [单项选择]Some linguists believe that the ______ age for children learning a foreign language is 5 to 8. A. optimistic B. optional C. optimal D. oppressed 参考答案:C 答案解析:optimal最佳的,optimistic乐观的,optional可选择的、随意的,oppressed受压抑的。
第36题: [单项选择]The workers finally called off the strike.
A. put off B. ended C. cancelled D. participated in 参考答案:C 答案解析:[解析] 本句意思是“工人们最终取消了罢工”。句中call off意为“停止,取消”。cancel“取消”,如:Why was the baseball game cancelled yesterda