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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热门试题

单项选择题

The word tycoon in the last paragraph is ______.

A．derived from a Japanese word, meaning a businessman with great wealth and power
B．an English translation of a Russian word, meaning a man of great consequence
C．borrowed from Portuguese, meaning an industrialist with a great man of money obtained illegally
D．rarely used now because of its derogatory meaning

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