单项选择题

The discovery of a new type of ceratopsian dinosaur suggests ceratopsians ______.

A．migrated to North America around 70-80 million years ago
B．arrived in Asia from North America about 90 million years ago
C．originated in Asia and later migrated to North America
D．could have moved to Asia from North America long ago

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单项选择题

The author's attitude to the ecological situation of the tropical forests is ______.

A．alarm and urgency
B．indifference and callousness
C．puzzlement and wonder
D．detached and scholarly

单项选择题

It can be inferred from the passage that ______.

A．Charles Williams had tried to prevent his son from the killing
B．Charles Andrew kept his scheme to shoot as a top secret
C．people who had the clue of the killing did not take Andrew's words seriously except two
D．some of Andrew's classmates found a revolver in his backpack