题目

The coach asked his staff to       the large group of journalists waiting for him to announce his training plants.    A.adapt to            B.appeal to            C.refer to        D.attend to 答案：D所有的生态系统，其成分一般都包括（　　） A、生产者、消费者和分解者B、生产者和消费者C、非生物的物质、能量和消费者D、非生物的物质和能量、生产者、消费者和分解者