假定其他条件不变，在一般情况下、下列选项中与图曲线DD′反映的变动关系相一致的是     
                 

若1＜a＜3，则化简|1﹣a|+|3﹣a|的结果为____．

    Today is Friday. Peter has six classes today. He goes to school at 7:30 a.m. At 8:00 a.m., he begins his first class. The first class is English. At 9:00 a.m., he has math. Peter likes math because it’s interesting. At 10:00 a.m. she has a biology class. Peter thinks it's very boring. Then at 11:00 a.m., he has a history class. That's his favorite subject. He can learn a lot about the past from history.
    Peter has lunch at school at about 12:00. Then he has a short break. At 1:30 p.m., he has a music class. At 2:30 p.m., he has a P.E. class. Peter likes this afternoon, because music and P.E. are easy and interesting. School is over at 4:00 p.m. Peter is happy because he can go home and have a good time on Saturday and Sunday.
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记集合$T=\left\{0,1,2,3,4,5,6,7,8,9\right\}$, $M=\left\{\frac{a_1}{10}+\frac{a_2}{{10}^2}+\frac{a_3}{{10}^3}+\frac{a_4}{{10}^4}|a_i\in T,i=1,2,3,4\right\}$,将M中的元素按从大到小排列，则第2013个数是（  ）

函数y= $\frac{1}{\text{x-}1}$ 的图象与函数y=2sinπx（﹣2≤x≤4）的图象所有交点的横坐标之和等于（   ）