阅读下面短文，在短文的空格内填入适当的词，使其内容通顺。

（ 每空格限填一词）（本题共五小题，每小题2分，满分10分）

Liu Xiang is not an overnight success. He was born in Shanghai ___小题1:__ 13th July, 1983 and, like many Olympic sports stars, he started training when he was very __小题2:. In Grade Four, he went to the Junior Sports School of Putuo District of Shanghai. Liu was encouraged at first to train as a high jumper. Then, in 1998, his skill at hurdling was noticed by his _小题3:_____ Sun Haiping. In 2004, he __小题4:___ the first Olympic Gold medal for China in Athens, Greece. Now he is training hard to go for more __小题5:__for China. Just because he was trained for gold!

按发生机制，呼吸遏制见于哪类呼吸困难（）

A.肺源性

B.心源性

C.中毒性

D.呼吸中枢性

E.精神性