食管腺位于食管的（）
A.黏膜固有层
B.黏膜下层
C.肌层
D.外膜
E.黏膜上皮
参考答案：B
衡量宏观税负的指标有()。
A.国民生产总值负担率
B.企业税收负担率
C.直接税负担率
D.间接税负担率
According to the modem view of the Phillips curve, the actual inflation is 6% , while the expected inflation 5% , the most likely initial effect is that:（）
A. the natural rate of unemployment will fall.
B. the natural rate of unemployment will rise.
C. unemployment will fall below its natural rate.
