Tom’s score on the test is the highest in the class. He _____.

A．should study last night

B．should have studied last night

C．must have studied last night

D．must study last night

损伤下述哪一结构．动物食欲增加而逐渐肥胖

A．下丘脑外侧区
B．下丘脑腹内侧核
C．下丘脑 * * 体核
D．下丘脑前区
E．边缘叶