单项选择题

According to the author, what theory was previously held and now is being questioned

A．That dinosaurs were warm-blooded.
B．That dinosaurs had four-chambered hearts.
C．That dinosaurs were swifter and stronger than reptiles.
D．That dinosaurs were cold-blooded.
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单项选择题
The author implies that birds ______.
A．move faster and have greater endurance than reptiles
B．move slower and have less endurance than reptiles
C．move faster and have greater endurance than dinosaurs
D．move slower and have less endurance than dinosaurs
单项选择题
One of the disadvantages of young adults returning to stay with their parents is that ______.
A．the young adults tend to be overprotected by their parents
B．most parents find it difficult to keep a bigger family going
C．there will inevitably be inconveniences in everyday life
D．public opinion is against young adults staying with their parents.
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