第8题: [单项选择]______the jungle did he realize that there was danger everywhere in it. A. Upon entering B. When he entered C. Only after entering D. After he had entered 参考答案:C 答案解析:[解析] 从句子结构上看,本句为一倒装句,而四个选项中只有c项才能引起倒装。
第19题: [单项选择]In 1986 the country initiated restrictions on the use of pesticides. A. instituted B. constituted C. prosecuted D. distributed 参考答案:A 答案解析:[解析] 本题中,initiated的意思是“开始,发动”。四个选项中,instituted的意思是“创立,开始”,如:institute an inquiry into(开始调查)。constitu