有哲学家论证，追求幸福需要常年乃至终身的不懈努力。这是因为，幸福是在充分实现个人价值的过程中所获得的满足感，这种感觉不是轻易就能得到的。这些哲学家夸大了追求幸福的难度。花前月下和情侣的一次悠闲散步，难道带来的不是难以忘怀的幸福体验?
以下哪项最为准确地指出了上述论证中存在的漏洞?

A -2x²cosx⁴． B <img width="187" height="43" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222846_2105.jpg" /> C <img width="190" height="44" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222847_2886.jpg" /> D <img width="86" height="43" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222848_3199.jpg" />

A 0． B 1． C 2． D <img width="24" height="36" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222850_4292.jpg" />

A 充分必要条件． B 充分条件但非必要条件． C 必要条件但非充分条件． D 既非充分又非必要条件．

A 2x-2． B 2x+2． C x-1． D x+1．

A 1． B x²． C e^x． D 2x．

A 0． B <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222854_6636.jpg" /> C 1． D <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222855_7818.jpg" />

A <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222857_8980.jpg" /> B <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222858_8845.jpg" /> C <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222900_0084.jpg" /> D <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222900_9917.jpg" />

A 1． B 2． C 3． D 4．

A 5． B 10． C 20． D 40．

A α₁必可由α₂，α₃，α₄线性表示． B α₂必可由α₁，α₃，α₄线性表示． C α₃必可由α₁，α₂，α₄线性表示． D α₄必可由α₁，α₂，α₃线性表示．