“一只手，提个蓝，两只手，端个盘，十只手，推动船；百只手，把何拦，这一民谣蕴涵的道理是团结。（  ）

若代数式$\frac{\sqrt{x-3}}{x-m}$中，x的取值范围是x≥3且x≠5，则m=____ ．

龚自珍在担任礼部主客司主事时说：“我朝藩服分二类，其朝贡之事……自朝鲜至琉球，贡有额有期，朝有期。西洋诸国，贡无定额，无定期。”龚自珍的表述，反映了当时士大夫的思想是

读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案。

    Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both  1 , plant a lot of trees. But this may not be the best way to make your home a  2 place.

   Last week we visited a park in Hebei. We were  3  to find most of the trees had been burned. The workers told us that the trees   4   soon after they were planted because they weren’t watered well enough.   5workers burned them and cleaned the place for   6  trees to be planted this year.   7  a card found in one of the dead trees, a student wrote, ＂I hope this tree will grow up with me to   8   the backbone(栋梁) of our country.＂The workers said that the survival(存活) of the trees was really more important than  9   trees were planted.

    Some people in Beijing now have a new idea that they can donate(捐赠) some money and let professionals (专业人士) plant and  10  the trees.