①核武器试验时大大小小突发的问题必层出不穷。

②1982年，他做了核武器研究院院长以后。

③人们劝他回去，他只说了一句话：“我不能走。”

④戈壁滩上常常风沙呼啸，气温往往在零下三十多摄氏度。

⑤一次井下突然有一个信号测不到了，大家十分焦虑。

⑥稼先虽然有“福将”之称，意外总是不能完全避免的。

小明和他父亲的年龄之和为54，又知父亲年龄是小明年龄的3倍少2岁，则他父亲的年龄为____岁．

    Davidson Black was a____(Canada) doctor who organized the excavation that led to the discovery of the bones in the Zhoukoudian____(cave) near Beijing. He was a specialist in the study of bones____it was his ambition to find and identify bones of early humans. His university was aware____the significance of his work. At first they gave him ample time to do his research, but____(late) they realized he was prepared to pursue it regardless of his students' needs and his____(teach) career, so they forbade him ____(travel) there any more. It was his assistant, Pei Wenzhong____made the discovery of these primitive bones and____(sharpen) tools. Davidson Black knew that his success was almost ____(entire) due to his assistant's systematic hard work.

日本法西斯势力的支持者和集中地是（   ）

拥挤的公交车上，各种声音此起彼伏，几个人在高声交谈，一位年轻人用手机大声播放音乐，车上一位乘客的手机铃声忽然响起，这位乘客对着手机大声地喊：“我听不见呀！你大声点！”请评价交车上人们的行为。