单选题
1.[2005.4]The satellite also demonstrated how it could provide help to people living in isolated areas where________is difficult.
A.transportation
B.instruction
C.application
D.compensation
正确答案：A
答案解析：此句的主体句为The satellite demonstrated how it could provide help to people。其后包含了两个从句。一是定语从句people（who）living in isolated areas，省略了who；二是where引导的地点状语从句。Instruction“指示”；application“请求，应用”；compensation“补偿，赔偿”。句意为：卫星也演示了它如何为那些生活在运输不方便的隔离区的人们提供服务。