下列哪种行为属于动物的学习行为 [ ]
A．刚出生的小袋鼠爬到母袋鼠的育儿袋中吃奶
B．小鸟在池边喂鱼
C．蜜蜂筑巢
D．小鸡绕道取食
D
Tom ______ some carrots for lunch. [ ]
A. can has
B. can have
C. is has
D. does have
最常见的继发性高血压是
A．肾血管性高血压B．原发性醛固酮增多症C．肾实质性高血压D．皮质醇增多症E．嗜铬细胞瘤
