根据句意及首字母填写单词。

小题1:Do you know the c____ answer to the math problem?

小题2:He was so t_____ that he drank plenty of water in one breath.

小题3:The man is good at playing Chinese c______

小题4:Many foreign t______ come to China every year.

小题5:The Red Army s________ in arriving in Gansu Province in 1936.

作为整个应用程序入口点的主程序至少应具有以下功能( )。

A．初始化环境

B．初始化环境、显示初始用户界面

C．初始化环境、显示初始用户界面、控制事件循环

D．初始化环境、显示初始的用户界面、控制事件循环、退出时恢复环境