①a=1；②b≠1；③c=2；④d≠4有且只有一个是正确的，则符合条件的有序数组（a，b，c，d）的个数是____．

阅读短文，判断下列句子与短文是否相符。

    John: I like my hometown. It is a small village. There are many rivers and bridges there. The water is clean. The air is fresh.

    Mike: I like my hometown, too. There are many mountains near my village. There are no tall buildings. The sky is blue. The clouds are white. I can run on the grass.

    John: Are there any pandas in the mountains?

    Mike: No, there aren't. Are there any fish in the rivers?

    John: Yes, there are. You can see many fish.

— OK, ________. Here is a room for you.

It's true that beauty does not always meet with a single, uniform standard. A person's cultural background, for example, may influence __________ he or she find attractive in others.