单项选择题

What aspect of potash does the passage mainly talks about

A．How it was made.
B．Its value as a product for export.
C．How it differs from other alkalis.
D．Its importance in colonial North America.
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单项选择题
The word stressed in paragraph 1 is closest in meaning to ______.
A．mentioned.
B．emphasized.
C．adjusted.
D．pointed out.
单项选择题
According to the passage, the softwoods in the South posed which of the following problems for southern settles
A．The softwoods were not very plentiful.
B．The softwoods could not be used to build houses.
C．The softwoods were not very marketable.
D．The softwoods were not very useful for making potash.
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