复殖吸虫典型的生活史有7个阶段：卵、毛蚴、（）蚴、（）蚴、（）蚴、（）蚴和成虫。
参考答案：卵、毛蚴、胞蚴、雷蚴、尾蚴、囊蚴、成虫。
It is greatly that Arthur gave back the money he found. [ ]
A. in his credit
B. to his credit
C. at his credit
D. with his credit
国家鼓励和支持开展循环经济科学技术的研究、开发和推广，鼓励和引导公民使用( )，减少废物的产生量和排放量。
A．节能
B．有利于保护资源的产品
C．节水
D．节材
E．有利于保护环境的再生产品
