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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单项选择题

The phrase the latter in paragraph 1 refers to ______.

A．alkali.
B．glass.
C．soda.
D．soap.

单项选择题

It can be inferred from the passage that, a major benefit of making potash was that ______.

A．it could be exported to Europe in exchange for other goods.
B．it helped finance the creation of farms.
C．it could be made with a variety of materials.
D．stimulated the development of new ways of glassmaking.