真皮是结缔组织。（）
参考答案：对
Tom likes _____ to the movies with his friends and _____ sports.
A．going, playing
B．go, play
C．going, play
D．go, playing
物体的色彩经（）三个环节，才能力被我们感觉知。
A、光
B、视网膜
C、眼睛
D、大脑
