从历史上看，美国的繁荣依靠企业不断涌现的新发明，这些发明促使汽车、飞机制造、化工、制药、电子、计算机等领域出现了一批新工业和新产品。因此，经济不断壮大的最好保障是企业在科学研究和发展方面增加经费。
以下哪项如果为真，最能削弱上述论证?

A 20％ B 25％ C 22％ D 15％ E 12％

A 2015 B 2016 C 2017 D 2018 E 2019

A 24 B 32 C 35 D 40 E 50

A <img width="27" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184314_4462.jpg" /> B <img width="27" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184315_8768.jpg" /> C <img width="27" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184316_9930.jpg" /> D 4 E 5

A 4 B 5 C 6 D 7 E 8

A 2 B <img src="https://www.beizhujiaoyu.com/uploads/202208/165235461343591.png" width="38" height="17" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/165235461813401.png" width="20" height="17" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/165235462397731.png" width="36" height="17" /> E <img src="https://www.beizhujiaoyu.com/uploads/202208/165235462711331.png" width="71" height="18" />

A <img width="27" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184331_4462.jpg" /> B <img width="26" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184334_3681.jpg" /> C <img width="40" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184334_5243.jpg" /> D <img width="27" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184336_4930.jpg" /> E <img width="40" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20220217184336_6493.jpg" />

A 2 B 2．4 C 3 D 3．6 E 4．2

A 80 B 120 C 160 D 200 E 240

A -6 B -9 C 6 D 9 E 0