[leolyy]

To all teachers who might show a smart hint:

First, as a chinese student I'll thank all those who helped me with my last question. This is my second question, and obviously not the ending one, hehe..

Here it is:

".. zoos are also a great tourist attraction which boosts the local tourism."

Why not --> ".. zoos are also great tourist attractions ..", I mean, why is that sentence using noun of single form as the objective? Is my latter alteration OK?

Thanks
Chengwei Liu