These natural parks are very important for preserving many animals, which would run the risk of being extinct(灭绝的)．
A. otherwise
B. other than
C. therefore
D. in another way
网友回答
(答案→)A. otherwise
B. other than
C. therefore
D. in another way
解析：考查副词：A. otherwise否则B. other than除了C. therefore因此D. in another way以另外的方式，otherwise“否则，要不然的话”，与虚拟语气连用。