Parks have special facilities such as swimming pools and lakes ( or ) ponds for boating.为什么用or

Parks have special facilities such as swimming pools

and lakes (or) ponds for boating.

为什么用or而不用and.

不是肯定句用and;否定句用or吗?

in most parks,there is no grass --------people can sit to have a rest 帮我把这连成句子 city, we, a ,picnic, have, in, often , one, large ,of the parks谢谢了 Parks have special facilities such as swimming pools and lakes ( or ) ponds for boating.为什么用or 英文spec是什麽意思？ visitors to the Disney parks 请问SPEC的全称是什么, 求SPEC CPU 2000 下载地址 Spec tek incorporated是什么生产厂商 GT4里的A-Spec point 是什么意思？ Large Spec long and Commercial short position