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

Which of the following is implied by the writer of this passage

A．The students of the Civil War usually concentrate on the economy.
B．The families of the Civil War are extremely worded about their living.
C．The students of the Civil War usually concentrate on the battlefield.
D．The families of the Civil War are extremely worded about the government.

单项选择题

SLICE: CAKE

A．mince: onion
B．core: apple
C．peel: peach
D．crave: turkey