有一个密度均匀的长方体铜块，被截成A、B两块，如图所示，已知L_A：L_B=3：2，则它们对水平桌面的压力和压强之比分别为（　　）

小林升人中学后，为方便上学，爸爸为他购买了一辆价值近千元的自行车。一天放学后，小林发现停放在学校大门外的自行车被盗。对此，你认为小林的正确做法是（     ）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    The other day, some of my classmates and I took a bicycle trip along the “Renmin Road”, where was specially built for people to relax ourselves. The scenery along the road was fascinating, with trees, flowers, hills and lakes on both side. We stopped by a lake for a rest, where a good many of people were playing happily. But something unpleasant catch our attention, There was rubbish here or there, and there were many plastic bags and bottles floated on the surface of the lake. Such beautiful place was so serious polluted. What a shame! In the end, we couldn't help collecting the rubbish after we left.

①一份固体溶于水得无色透明溶液，加入足量BaCl₂溶液，得沉淀4.46g，在沉淀中加入过量稀盐酸，沉淀没变化．

②另一份固体与过量NaOH固体混合后充分加热，产生使湿润的红色石蕊试纸变蓝色的气体0.672L（保准状况）．

下列说法正确的是（   ）