单项选择题

The factor which does NOT influence the size of the workforce is __________.

A．the size of population
B．age distribution of the population
C．national economy
D．natural increase
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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.
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
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