①血红蛋白②葡萄糖③二氧化碳和氧④Na+⑤血浆蛋白
A:①②③
B:①④⑤
C:②③④
D:②③④⑤
About 200,000 ____ (游客) came to Tai'er zhuang Ancient Town during May 1 holidays. It's difficult to believe.