这里应用 of 还是用 in?

有一读者问:有这样一道填空题:

(1)The Great Wall is one of the wonders_________the world.

我认为应填 of,但有人则认为应填 in,请问该填哪一个?

我们同意你的看法,这里填 of 较好。再如:

(2)The Grand Canyon is one of the wonders of the world.

(3)The Niagara Falls is one of the natural wonders of the world.

以上两例皆摘自国外具有权威性的英语词典,of皆强调从属关系。但强调“范围”,则用in较好,如:

(4)The Great Wall is a real wonder in the world.