单项选择题

From the first paragraph, we get the impression that George Marsh ______.

A．cherishes his adolescence memories.
B．thinks highly of the efficiency of agriculture.
C．may not have happy memories of past time.
D．cannot remember his adolescence days.

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单项选择题Which of the following statements is TRUE of Jeremy Thomas and Carly Stevens's surveys

A．They reported the results of the surveys to the government.
B．There were no such comprehensive surveys done before.
C．The surveys show there are more plant species extinct.
D．Other ecologists will do more surveys based on theirs.

单项选择题According to David Wedin, the extinction of many species are caused by human beings' ______.

A．arrogance.
B．ignorance.
C．nonchalance.
D．blunder.