题干
— I’m really ______ before the exam.
— Take it easy. Surely you are the best.
— Take it easy. Surely you are the best.
A：cool
B：seriou
C：nervou
D：patient
答案(点此获取答案解析）
C
2Z(g) △H＜0。从反应开始经过t1后达到平衡状态，t2时由于条件改变，平衡受到破坏，在t3时又达到平衡，据右图回答：从t2→t3的曲线变化是由哪种条件引起的（ ）
