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问题 选择题
若α∈(
π
2
，π)，tan（α+
π
4
）=
1
7
，则sinα=（　　）
A．
3
5
B．
4
5
C．-
3
5
D．-
4
5
答案

∵α∈(

π
2
，π)，tan（α+
π
4
）=
1
7
，

∴tanα=tan[(α+

π
4
)-
π
4
]=
1
7
-1
1+
1
7
=-
3
4

∵1+tan2α=

1
cos2α
=
25
16

∴cosα=-

4
5

∴sinα=

3
5

故选A

单项选择题

有一建设项目与城乡规划有些矛盾，建设单位直接找到领导汇报方案，领导原则同意该方案并让转告规划局在规划上再协调一下。但建设单位根据“原则同意”就直接开工建设。
请问：这个建设项目是什么性质的建设( )

A．领导已同意是合法的
B．没有办理审批手续，属违法建设行为
C．领导同意了，办不办审批手续都合法
D．协调不下来挨批评，不管它是什么性质
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单项选择题

If market participants come to believe that the expected inflation rate embedded in the current nominal risk-free rate of interest is less than will actually occur, this will have the effect of:（）

A. increasing demand for funds and decreasing the supply until the nominal risk-free rate decreases to reflect the new expectations.

B. decreasing demand for funds and increasing the supply until the nominal risk-free rate increases to reflect the new expectations.

C. increasing demand for funds and decreasing the supply until the nominal risk-free rate increases to reflect the new expectations.
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