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单项选择题

In the mass extinction 65 million years ago, ______ of ……

In the mass extinction 65 million years ago, ______ of all species on earth vanished.

A．two thirds
B．half
C．90%
D．30%

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热门试题

单项选择题Why was Leacock dubbed as a pro-American British imperialist

A．Because he was a Briton who adored American politics.
B．Because he liked to read American newspapers.
C．Because he lectured on the importance of friendship between U.S. and Britain.
D．Because he chose to live close to Americ

单项选择题The author was probably ______.

A．a historian
B．a reporter
C．Leacock's colleague
D．a Navy officer

单项选择题Leacock can be described as all of the following EXCEPT ______.

A．a historian
B．aloof
C．humorous
D．an immigrant

单项选择题The book on the fictional town of Mariposa presumably ______.

A．related the success of Leacock's farm
B．joked about the peculiarities of the people in Orillia
C．exemplified the industry and effort of the author
D．was the work most likely to endure

单项选择题Which of the following is TRUE

A．Environmental changes must have caused the end-Permian mass extinction.
B．Massive volcanic eruptions might have caused the end-Permian mass extinction.
C．The disappearance o dinosaurs was a consequence of the end-Permian mass extinction.
D．Marine animals appeared as a result of the end-Permian mass extinction,