How is this passive and this 不思議に思った meant?


The following is an instruction for writing a small composition:

> 日本に来て、または外国に行って、次のようなことでカルチャーショックを受けたことがありますか。  
>  1) それまで聞いたことがない音を聞いて、びっくりした。  
>  2) 国でよく聞いていた **音がほとんど聞かれないので** 、 **不思議に思った** 。

First, my attempt at translation:

"Have you experienced culture shock from the following things while coming to
japan or going to a foreign country?  
1) Hearing a sound you haven't heard so far, you were surprised.  
2) Because

...you mostly don't get to hear sounds you often hear in your country...  
...sounds which you often heard in your country mostly aren't (to be) heard...

...you think it's strange.  
...you think strangely (like "feel" strange?).

So, obviously my problem lies with the two bold parts.

I think the passive construction could be an indirect passive? I asked about
the indirect passive before but I still feel very insecure about it. I also
don't know whether I translated it correctly, should it be an indirect passive
(version 1 of my translation shall represent the case where I assumed that it
is an indirect passive.).

Second, the 不思議に思った gives me a little headache because I'm not sure what
effect 不思議に has in this case ^^ It could mean that "I think of something as
strange" (which I think is very likely here) or it could mean that "I think
strangely", which would be the most direct/closest relation between the adverb
and the verb here, but I think it isn't very likely that this is the case
here.




You basically have the right ideas! Think of the passive this way:

> 日本以外の国ではノリがほとんど食べられない。
>
> In countries other than Japan, Nori isn't eaten much.

It really is just a normal passive. Just like sentences such as "Sounds aren't
being heard", "Snakes are rarely seen" and so on. You could put this sentence
in active form as

> ... 聞いていた音を耳にしないので、...

But the passive form sounds a little nicer (at least to me).

> 不思議に思う

This is a set phrase meaning you think something is strange, perplexing,
bewildering or unusual. So basically your first guess was correct!

