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【单选题】
Section A Directions: In this part, you will read five paragraphs. Choose the right topic for each paragraph.Paragraph 1People often refer to taxes in terms of their being much too high. In reality, they are probably even higher than you think, because in addition to the federal income tax we are now studying, there are many other Federal, State, and local taxes, including sales taxes, inheritance taxes, state income taxes, personal property taxes, real estate taxes, and others. These are just some of the most obvious ones.A.
Taxes are much too high.
B.
We pay more taxes than we may realize.
C.
Inheritance taxes and real estate taxes are unfair.
D.
Some taxes are hidden.
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举一反三
【简答题】若 e 1 ， e 2 是夹角为 π 3 的两个单位向量，则 a =2 e 1 + e 2 ， b =-3 e 1 +2 e 2 的夹角为______．
【单选题】已知 a , b , e 是平面向量, e 是单位向量.若非零向量 a 与 e 的夹角为 ,向量 b 满足 b 2 − 4 e · b +3=0 ,则 | a − b | 的最小值是( )
A.
− 1
B.
1
C.
2
D.
3
【简答题】已知 e 1 、 e 2 是夹角为 2π 3 的两个单位向量， a = e 1 -2 e 2 ， b =k e 1 + e 2 ，若向量 a 、 b 的夹角为钝角，则实数k的取值范围为______．
【简答题】转向系是由 、 、 三大部分构成。
【简答题】若 e 1 ， e 2 是两个单位向量， a = e 1 -2 e 2 ， b =5 e 1 +4 e 2 ，且 a ⊥ b ，则 e 1 ， e 2 的夹角为______．
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