诗句“春蚕到死丝方尽，蜡炬成灰泪始干”常用来比喻老师的无私奉献精神，其中也包含着许多化学知识。下列对诗句中涉及的化学知识分析不正确的是

我国目前在西部地区大力勘探开发石油，其地点是（　　）

450000平方米=____公顷

9公顷=____平方米

首字母填空
(1)His sister gets up at h ____ past six in the morning.
(2)Mr and Mrs Wang go to work by s____ every day.
(3)My home is about 5 k____ from our school.
(4)He always gets early ,he is n____  late for work.
(5)The classroom is too n____  , I can't hear you.

属于特异性免疫的是（    ）