单项选择题

The most suitable title for the passage would be ______.

A．Nitrogen Pollution.
B．Ecological Issues.
C．Goodbye, Skylarks.
D．Agricultural Advances.
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单项选择题
What is the difference between today's ecological change and the five changes in ancient times
A．Species like the dinosaurs brought the ice ages to an end.
B．A volcanic eruption might lead to a great catastrophe.
C．Today's change is mainly caused by agricultural advances.
D．Today's change attributes to a multitude of reasons.
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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