题目

—Oh，a nice photo！Is this your uncle's child? —Yes，it is my__ __． A．cousin      B．sister        C．brother       D．daughter 答案：A6．用自己喜欢的方法计算．（7.5+2.5）×0.25；[1-（$\frac{1}{2}$×$\frac{1}{4}$）]×36；   $\frac{11}{23}$×$\frac{19}{31}$+$\frac{12}{23}$÷$\frac{31}{19}$；     3÷$\frac{3}{4}$-$\frac{1}{4}$÷3．