新完全マスター(N3)　ぐらいきれいな　vs　ぐらい高い


『新完全マスター(N3)』に出てくる問題「日本で富士山ぐらい＿山はないと思う。」の答えは「きれいな」ですか。

(１・きれいな ２・高い ３・ほかの)

Why not 高い?

Could you please explain this in detail?  
(I was looking for an answer here but did not find)




I think No.2 is a bit unnatural because it is a well known fact that Mt. Fuji
is the highest mountain in Japan. So 思う is a bit unnatural. 日本で富士山ぐらい高い山はない
would be natural. For example, it is a bit odd if American people say "I think
the US borders on Mexico", isn't it? No.1 would be the answer.




I think No.2 is a bit unnatural because it is a well known fact that Mt. Fuji
is the highest mountain in Japan. So 思う is a bit unnatural. 日本で富士山ぐらい高い山はない
would be natural. For example, it is a bit odd if American people say "I think
the US borders on Mexico", isn't it? No.1 would be the answer.

