单选题 The groups that don't want us to eat any animals at all are so radical and off-the-wall that we don't even worry about them.

【正确答案】 A

【答案解析】题中off-the-wall古怪的，疯狂的，A项的crazy“疯狂的，狂热的”与之相符。reasonable有道理的；persuasive善说服的；revealing发人深省的。