太阳能不像传统的煤、气能源和原子能那样，它不会产生污染，无须运输，没有辐射的危险，不受制于电力公司，所以，应该鼓励人们使用太阳能。
以下哪项陈述如果为真，能够最有力地削弱上述论证?

A t² B 2t² C 1 D 2

A <img width="122" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222910_7886.jpg" /> B <img width="120" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222912_3824.jpg" /> C f(x)g(x)>f(a)g(a)． D f(x)g(x)>f(b)g(b)．

A <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222914_5386.jpg" /> B <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222915_1167.jpg" /> C <img width="23" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222916_6949.jpg" /> D <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222917_2261.jpg" />

A 1． B e-2． C 2-e． D 2+e．

A 点(1，1)是函数的极大值点． B 点(1，1)是函数的极小值点． C 点(0，0)是函数的极大值点． D 点(0，0)是函数的极小值点．

A (2，4)． B (1，3)． C <img width="80" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222919_4292.jpg" /> D (0，4)．

A 0．2 B 0．3 C 0．7 D 0．8

A 1． B <img width="24" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222921_5542.jpg" /> C <img width="30" height="48" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222923_0386.jpg" /> D <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222923_6813.jpg" />

A -18． B -9． C -6． D -3．

A 2． B -2． C 1． D -1．