What should we do when we meet people for the first time in China?
A:Kiss.
B:Touch noses.
C:Put hands together.
D:Shake hands.
1a 无脊椎骨 2
1b 有脊椎骨 3
2a 身体分节,有外骨骼 R
2b 身体不分节 S
3a 卵生,提问不恒定 4
3b 胎生,体温恒定 P
4a 生活在水中,用腮呼吸 Q
4b 生活在陆地,用肺呼吸 M