单项选择题

Witmer’s research leads people to believe ______.

A．Tyrannosaurus Rex had lips and Triceratops had cheeks
B．dinosaurs might have looked like mammals such as sheep
C．dinosaurs might not have looked like what we thought
D．dinosaurs must have looked like birds or crocodiles

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热门试题

单项选择题

The author is primarily concerned with describing ______.

A．research into tropical-forest biology on Barco Colorado Island
B．how the whole ecosystems can depend on the survival of a single species
C．the life cycle Of the fig wasp
D．the importance of forests to the human race

单项选择题

The author would like to see ______.

A．more buildings erected in the forests
B．fig trees planted in all forests
C．scientific efforts diverted to bomb making
D．the preservation of as many diverse species as possible