— Where was your dad at this time last night? —He was talking with my uncle I was looking for some information on the Internet.
A：after
B：until
C：since
D：while
“你下岗，我上岗”这句出现在香港政权交接仪式上的话语，令全体国人激动不已的主要原因是
本市公共场所已全面实施禁烟。香烟烟雾中易与血红蛋白结合的物质是
