ここから本文です。
Question48 Western/Hamanako
 |
 |
 |
 |
 |
 |
 |
 |
 |
This is a picture of Washizawa Air Hole you can find in Hamamatsu City. Although it is called an air hole, it is actually a cavern. Although it is not so famous, it is the only ______ ceiling cavern, a rare kind of one in Japan. What fits in the blank?
 |
 |
 |
| right angle | horizontal | curvature |
 |
|
|