问题补充：
. However, at times this balance in nature is disturbed, a number of possibly unforeseen effects.
A. lying in
B. calling in
C. taking in
D. resulting in
答案：
A. lying in
B. calling in
C. taking in
D. resulting in
解析：平衡被打破，会产生许多预料不到的影响，“导致，产生”为result in。lie n意为“在于”；call in意为“召，请进来”；take in有“吸收”之意。
