The underlined part "this tiny human" in Paragraph 2 refers to （）

单项选择题What is pretty much settled according to Paul Sereno（）

A．Half of the dinosaurs lived alone.
B．Most dinosaurs moved long distances.
C．Many dinosaurs settled in the north.
D．Some dinosaurs lived in big groups.

单项选择题56（）

A. Hold the line
B. flight number
C. ask a question
D. To New York
E. May I have you name
F. reconfirm my seat
G. please check in
H. On May 11th