题目

---Which is ______, the sun, the moon or the earth?   ---Of course the sun is.A．smallerB．bigger C．the biggestD．the smallest 答案：C解析:略14．计算下面各题．（1）2520-36×42÷27           （2）2+8.4÷3.5×2（3）（$\frac{2}{3}$-$\frac{1}{2}$）÷$\frac{5}{6}$+$\frac{14}{15}$           （4）36÷$\frac{1}{2}$-$\frac{4}{5}$×$\frac{1}{2}$．