I have never talked about my private life with other people.
A：fantastic
B：personal
C：ordinary
经过学习我们初步认识到，化学反应的快慢、反应现象等与反应条件、反应物量的多少等因素有着密切的关系．请各举一例加以说明．
— How do you come here? You look tired(累的).
—________.
关于人体氨基酸的叙述，正确的是（ ）
