题目:An increase in money supply causes the LM curve to shift to the right. To balance income changes close to the movement of the LM curve, it is necessary to
A:The LM curve is steep, and the IS curve is also steep
B:The LM curve is steep, while the IS curve is gentle
C:The LM curve is as smooth as the IS curve
D:The LM curve is gentle, while the IS curve is steep
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