核武器的杀伤破坏因素中（）持续的时间比较长。
A.光辐射
B.冲击波
C.核电磁脉冲
D.放射性沾染
参考答案：D
—It's reportcd that people in Japan live much longer than Americans.
—What are their_______do you know?
A. secrets
B. ideas
C. lives
D. words
最终裁决
