单项选择题

Why has the number of camels in India been decreasing in recent years

A．Because they are dying from traveling too far .
B．Because they are short of food.
C．Because they are infected with a disease.
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What is a symptom of multiple sclerosis
A．Loss of the ability to hear.
B．Loss of the ability to see well.
C．Loss of the ability to speak clearly.
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What do the two speakers probably do for a living.
A．Office clerks.
B．Printers.
C．Archiects.
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