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问题 单项选择题

某投资方案，当i1=10%时，净现值为124万元;当i2=15%时，净现值为-36万元，则该投资方案的内部收益率是()。

A.10.875%

B.13.875%

C.12.875%

D.11.875%

答案

参考答案：B

解析：本题考核的是内部收益率的求法。内部收益率r=10%+(15%-10%)*[124/(124+36)=13.875%

阅读理解

阅读理解。

     People invented poetry as they helped to remember things. Before the invention of writing, there was no other way but(除了)to remember important things. People early founded that rhyme and rhythm(节奏和韵律) were very helpful when they are trying to remember things. So they made poems to help them

remember all the things they needed to know and passed on from generation to generation. For example,

they could easily remember their history with poetry. They recited great stories about their ancestors and

the wars that they experienced.

根据上面的短文，判断正（T）误（F）

(    )1. People invented poetry only to have fun.

(    )2. Rhyme and rhythm were helpful when people remembered things.

(    )3. People could remember their history easily without any help.

(    )4. Before the invention of writing, people couldn’t remember any important things.

(    )5. Poetry could help .people remember everything.
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单项选择题

草本花卉扦插繁殖常采用生长激素浸蘸，其使用浓度为（）

A、50ppm以下

B、50～500ppm

C、500～1000ppm

D、1000ppm以上
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