题目

A new subway will have been completed in the city by the end of the year 2007 ,                               will be very convenient for us to get around shopping and sightseeing. A.      when it      B. where it      C. when that      D. which that 答案：A 解析: 考定语从句及北的用法。 科学散文具有________和________的特点，首要任务是传播科学知识，并在一般科普作品的基础上突出文学色彩。