The sad truth is that ecosystems are（）fragile and intensely complicated.

The effects of childhood abuse and lack of parental affection can last a lifetime.A．attachmentB．consentC．guidanceD．supervision 点击查看答案

The difficulties facing these hikers stem from the bad weather they have been having.A．cling toB．arise fromC．result inD．compensate for 点击查看答案