对放射性高度敏感的肿瘤是()
A．鼻咽癌
B．食管癌
C．肺癌
D．霍奇金病
E．胃癌
参考答案：D
蝴蝶飞行的速度可达每分钟550米，可以写作（ ）。
-Did you watch TV then?
-_____, but it wasn't in colour.[ ]
A. Yes,I didn't
B. No,I did
C. Yes,I did
D. No,I didn't
