下列选项中能正确表示苍蝇完全变态发育过程的是             （　 ）

与1+$\sqrt{5}$最接近的整数是（　　）

某同学要探究单摆来回摆动一次的时间与什么因素有关，于是他准备了不同质量的小铁球（质量已知）、细绳、刻度尺、铁架台等器材，实验装置如图所示．

根据短文内容选择答案。

      There are four people in the twins’ family. They are the twins, their father and their mother.

      The twins’ names are Lucy and Lily. They are fourteen. They are in the same class in the NO.1 Middle School. They are very good students. They not only work very hard but also sing very well. They want to join the music club. Lucy wants to play the piano. Lily can play the guitar.

      Their father, Mr. King, is a teacher. He teaches English in a school near his home. Their mother, Mrs. King, is a teacher, too. She teaches Chinese. Mr. and Mrs. King are in different schools. But they have the same hobby — play the guitar.