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A
The fridge not only enhances human happiness but also affects environment evidently.
B
The fridge’s effect upon the environment has been evident, while its contribution to human happiness has been insignificant.
C
The fridge’s effect upon the environment has been evident, while its contribution to human happiness has been less and less.
D
The fridge’s effect upon the environment has been evident, and its contribution to human happiness has been great.
正确答案 ：B
解析
B项：effect意为“影响”，evident意为“显而易见的”，contribution意为“贡献”，insignificant意为“微不足道的”。句意“冰箱对环境的影响是显而易见的，而它对人类幸福的贡献是微不足道的。”符合题意，故选B。
A项：句意“冰箱不仅提高了人们的幸福感，而且对环境也有明显的影响。”不符合题意，故排除。
C项：句意“冰箱对环境的影响是显而易见的，而它对人类幸福的贡献却越来越少。”不符合题意，故排除。
D项：句意“冰箱对环境的影响是显而易见的，它对人类幸福的贡献是巨大的。”不符合题意，故排除。
故本题答案为B。
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