动物组织中具有保护、分泌功能的是[ ]
A．上皮组织
B．肌肉组织
C．神经组织
D．结缔组织
A
—Would you like camping with me?
—I’d like to. But I’m busy my homework.
A．to go; to do
B．to go; doing
C．going; to do
D．going; doing
简述空调运作的过程。
