题目内容：
The walls function like a dam to keep the water _____ and the structure lies naturally within its surroundings, remaining invisible from a distance.选择一项：
A.
in
B.
out
C.
of
参考答案：
选择题：The walls function like a dam to keep the water __
- 题目分类：国家开放大学理工英语1
- 题目类型：选择题
- 查看权限：VIP
选择一项：
A.
in
B.
out
C.
of