单项选择题

Tuberculosis is highly infectious because ______.

A．spores are resistant to drying
B．the causative organism is encapsulated
C．droplets of sputum remain infective for a long time due to the resistance of the organisms to drying
D．none of these

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单项选择题

With what topic is the passage primarily concerned

A．The civilian response to the Civil War.
B．The causes of the Civil War.
C．Where the Civil War bottles were fought.
D．Why the South lost the Civil War.

单项选择题

According to the passage, during the Civil War the South no longer provided the North with ______.

A．cotton
B．shoes
C．hides
D．wool