情感强度强，情感变化速度迅速
A．胆汁质B．抑郁质C．多血质D．黏液质E．少血质
参考答案：E
____makes some people appear astonishingly youthful while others seem much older than their actual age?
A．What it is
B．What is it that
C．What it is that
D．Why it is what
异烟肼与香草醛反应，干燥后测定其熔点为（）
A.248～251℃
B.208～211℃
C.218～221℃
D.228～231℃
E.238～241℃
