A. benefited from B. involved with C. compared with D. resulted from
A. reliable B. stable C. countable D. flexible
A. force B. fight C. false D. fault
A. 放射性核素水中浓度高 B. 放射性核素在水中半衰期长 C. 生物富集作用 D. 放射性废物向水中排放 E. 其他未明原因