家蚕的发育属于完全变态，其发育过程是（　　）

现有资料表明：①K⁺不能通过双分子层的人工膜，②缬氨霉素是一种脂溶性抗菌素，与K⁺具有特异亲和力，③在人工膜上加少量缬氨霉素，K⁺可以通过膜，Na⁺仍不能通过膜。下列关于K⁺能通过膜Na⁺不能通过膜的原因解释中，正确的是

（﹣3x+1）（﹣2x）²等于（　　）

根据材料内容及所给首字母提示填空，使材料意思完整、通顺。

    Susan was a woman who didn't like animals at all．She never w____ to keep any pets at home．To her, all pets were very dirty and boring．Susan could never understand w____ people would like to have pets in the house．"It is so stupid(愚蠢的)!"she always said．

    Last month Susan's daughter, Penny,came home from school w____  a mouse in a box,Susan was very angry．But Penny said that it was her h____．Her teacher asked each student to take care of an animal and l____ to get along with it．Susan had to say y____.

    It was fun for Penny at the very beginning, but then she got quite lazy(懒的) and f____to do her homework．It became Susan's homework．She g____it food and water every day and found that the mouse was in fact not dirty．She e____ talked to it! It was not boring or stupid!Now Susan is having a good time with"her" mouse．She named it Nini．And she is going to buy a____one to make a pair．

“五水共治”指的是治污水、防洪水、排涝水、保供水、抓节水，绍兴市近几年在水污染治理方面取得了显著成效，全市工业废水排污达标率100%，生活用水也得到了很好的治理。