题目

完形填空 ，阅读下面短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。Have you been back to the place __1_your ancestors lived, worked, studied andplayed?  Robert Qian , a Chinese Canadian, already has. Now in China, he has found that his family 2like a tall tree with long roots.    Robert is just one young overseas Chinese who 3to visit his ancestors’homeland, as part of the In Search of Roots summer camp program. The program 4 by the local government of Guangdong Province. This program started in 1980, and so far has brought 5 overseas 两个完全一样的三角形可以拼成一个________．