日本第一高峰是（）。
A.谷川岳
B.大雪山
C.阿苏山
D.富士山
参考答案：D
若f(x)＝f1(x)＝，fn(x)＝fn－1[f(x)](n≥2，n∈N*)，则f(1)＋f(2)＋…＋f(n)＋f1(1)＋f2(1)＋…＋fn(1)＝
A．n
B．
C．
D．1
_______ is estimated that 25 million school lunches are sold each day.[ ]
A. It
B. That
C. This
D. As
