单项选择题

What does the passage mainly talk about

A．The three benefits provided by trees.
B．Trees and soil conservation.
C．The various uses of trees.
D．The different attitudes of the government and the villagers toward trees.

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热门试题

单项选择题

What eventually happened to the rich, powerful country 2000 years ago

A．Its people died of hunger.
B．It fell to pieces.
C．It became a giant empire.
D．It built many ships with wood.

单项选择题

The role of trees is to ______.

A．loose soil
B．keep soil in position
C．harden soil
D．Both A and B.