根据句意, 用括号内所给单词的适当形式填空。

小题1:A person who does not like fishing usually appears __________ (patient) in doing his work.

小题2:__________ (hope), the Chinese government can control the increasing of housing price.

小题3:After several lengthy ­­­­­­­­­­­­­­­­­______________(discuss) , they decided to leave.

小题4:Many people post photos of ________(they) on Facebook. They get to know each other on it.

低O₂对呼吸中枢的主要作用是（）

A．刺激外周化学感受器

B．刺激中枢化学感受器

C．直接抑制呼吸中枢

D．直接刺激呼吸中枢