下列除哪项外，其他均为动物行为的表现形式[ ]
A．动物取食
B．静止不动
C．猫头鹰的“脸盘”像猫脸
D．冬眠
答案：C
What day is it today? [ ]
A. It's Tuesday.
B. It's Friday.
C. It's Thursday.
绝缘试验时，tgδ随温度增加而（）。
A.增加
B.不变
C.减小
D.先增大，后减小
[ ]