单项选择题

Which of the following is NOT a medical problem ancient Egyptians used to have

A．Dental decay.
B．Tooth erosion.
C．Malignant tumors.
D．Insomnia.
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单项选择题
______participated in the debate between the Bush and Kerry campaigns.
A．Cheney and Kerry
B．Bush and Kerry
C．Cheney and the head of Democratic Party
D．The heads of Democratic and Republic parties
单项选择题
Wheat supplies have decreased in recent years because______.
A．wheat prices are very low in the world
B．the demand for wheat is decreasing
C．many regions are affected by drought
D．the wheat consumption is becoming less
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