the climate here is （） that of Kunming.
题目应是是没有that的吧
然后选项A 是 as good as that
也就是 the climate here is as good as that of kunming.
这里的that是代词,指代了the climate,句子相当于the climate here is as good as the climate of kunming.
如果要选b 要改成the climate here is better than that of kunming.