比 少____个

根据短文内容，判断正误。符合短文内容，对的写正确，错的写错误。

    Ann and Lucy visit the zoo today. They see many animals there. Look, a bear is under the tree. You can see two pandas near the river. Ann and Lucy like pandas very much. There are two tigers and four leopards at the zoo. Some foxes, rabbits and squirrels are behind the rocks. Six sheep and eight goats are on the ground. They are eating grass. Ann and Lucy like all the animals at the zoo. They have a good time today.

下列变化中，属于物理变化的是（    ）

同时抛掷两枚质地均匀的硬币，出现“一正一反”的概率是____．