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问题 单项选择题 A1型题

典型早期釉质龋病损的前沿是（）。

A.表层

B.再矿化层

C.暗层

D.病损体部

E.透明层

答案

参考答案：E

解析：透明层位于病损的前沿，和正常釉质相连并呈透明状。故本题答案是E。易误选C。

单项选择题

风疹伴呼吸困难，除取主穴外，还宜加（）。

A、天突

B、膻中

C、内关

D、天枢

E、足三里
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单项选择题

Marko Tskitishvili, an economist, has been studying the drop in the price of the average household computer in the U.S. and wonders if computers should still be considered a luxury good or if it has now become a normal good. He conducts a survey of 500 people and finds the following:

Assume that 1998 is the base date. Based on the above data, Tskitishvili would conclude that a computer is a:（）

A. luxury good with income elasticity of 1.01.

B. normal good with income elasticity of 0.84.

C. luxury good with income elasticity of 1.18.
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