[解析]
(1)B 细节理解题.文章第二段说Kids will often become more dutiful when threatened with punishment,and work harder when promised a valuable reward,当孩子们受到惩罚的威胁时,会变得更负责,有奖励时,会更努力.故选B.
(2)A 猜测词意题.划线单词所在的句子说We also create children who may temporarily(临时)perform to a certain standard,but who aren't likely to continue the performance without the carrot hanging in front of them给了孩子某种标准,孩子有好的表现是临时的,如果没有了奖励他们就不会继续表现良好了,可以知道划线部分应该是和前面的reward表达一样的意思.故选A.
(3)D 细节推断题.文章第五段说Good values have to be grown from the inside out好的价值观是来自内心的;Parents can help give their children a sense of shared responsibility and discipline which can last a lifetime父母应该帮助孩子养成有责任感和自律的品格,这些可以让他们收益终身.故选D.
(4)B 主旨大意题.文章一开始说For many years there's been a debate about rewarding our children.Does it work?Is it effective多年来人们都在争论该不该给孩子奖励,到底有没有效果.后面讲述了不同的观点.故选B.