单项选择题

A．He shouldn’t put on his shoes.
B．He should go to a movie.
C．He ought to work on his paper.
D．He shouldn’t write about the movie.
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单项选择题
A．Scientists have studied them for centuries.B．They were meat eating as well as plant eating.C．They wandered the earth for millions of years.D．They lived on land, in the sea, and in the sky.
A．Scientists have studied them for centuries.
B．They were meat eating as well as plant eating.
C．They wandered the earth for millions of years.
D．They lived on land, in the sea, and in the sky.
单项选择题
A．By digging site.B．By reconstructing skeletons.C．By observing them closely.D．By living with them.
A．By digging site.
B．By reconstructing skeletons.
C．By observing them closely.
D．By living with them.
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