原子总数相同、电子总数或价电子总数相同的互为等电子体，等电子体具有结构相似的特征，下列各对粒子中，空间结构相似的是（　　）

①CS₂与NO₂

②CO₂与N₂O    

③SO₂与O₃

④PCl₃与BF₃．

读短文，判断正误。

Disneyland

   Would you like to see the whole world on one trip(旅行)? Welcome to the wonderful world of Disneyland. In Disneyland, you can see many different countries(国家) in one day. You can see people and buildings（建筑物） from every country. You can eat many different kinds of food in one day. There are restaurants from Australia, England, America, Japan and China.

  There is much to do in Disneyland. You can do a lot of shopping and buy many funny and beautiful gifts. You can see a mouse taller than you! His name is Mickey Mouse.

取某种植物生长状态一致的新鲜叶片，用打孔器打出若干圆片，圆片平均分成甲、乙、丙三组，每组各置于一个密闭装置内，并分别给予a、b、c三种不同强度的光照，其他条件一致。照光相同时间后，测得各装置内氧气的增加量如图所示。下列叙述错误的是 (　　)

从﹣3，﹣1，0，2四个数中任选两个，则这两个数的乘积为负数的概率为（　　）