A) 根据首字母或中文提示，写出正确的单词。

小题1:         is the most important thing while we are crossing the road. (安全)

小题2:The hall has ________ (出口) on its three sides.

小题3:The  _______(士兵 ) died in the war were honoured as the heroes of the country.

小题4:He has had his digital camera for _______ (超过) five years.

小题5:Before the project of Sanya , many ______(移民) left their hometown for their new living places.

SARS病毒研究属于（）

A．现代生物技术

B．绿色技术

C．信息技术

D．复杂性科学