单项选择题

A．Research assistants.
B．Magazine publishers.
C．Careless authors.
D．Inexperienced students.
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单项选择题
A．Survival strategies for extreme Antarctic cold. B．Why inactive volcanoes become active. C．The principal causes of global warming. D．The effects of volcanoes on the Antarctic ice sheet.
A．Survival strategies for extreme Antarctic cold.
B．Why inactive volcanoes become active.
C．The principal causes of global warming.
D．The effects of volcanoes on the Antarctic ice sheet.
单项选择题
A．He no longer watches much television. B．He prefers the comedies from the sixties. C．Television comedies haven’t improved since the sixties. D．He hasn’t seen many of the old shows.
A．He no longer watches much television.
B．He prefers the comedies from the sixties.
C．Television comedies haven’t improved since the sixties.
D．He hasn’t seen many of the old shows.
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