问题补充:
There is hardly an environment on earth some species of animal or other have not adapted successfully.
A. to which
B. in which
C. for which
D. on which
答案:
A. to which
B. in which
C. for which
D. on which
解析:考查定语从句:先行词是an environment,定语从句中adapt后面缺少介词to,用to which引导定语从句。句意:地球上很难有一种环境,一些动物和其他的物种不能成功的适应的。选A。