单项选择题

Which of the following statements is true

A．Columbia frightens urban planners.
B．Although it's very beautiful, Columbia makes young people bored.
C．Columbia is just in an urban planner' s dream.
D．There are rows of grimy buildings and few grass and trees in Columbia.

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单项选择题

The Para 5 mainly discusses ______.

A．how animal wastes enriched land
B．how plant roots protected the land
C．how humus becomes useful
D．how a forest creates its own soil and protects the watershed

单项选择题

In this sentence In short, land is fragile. (Line. 1, Para. 7), what does the word fragile mean

A．Very poor.
B．Rich.
C．Taken.
D．Easily destroyed.