单选题 It is better for the environment if as much of all packaging as possible is made from materials that are biodegradable in landfills. Therefore, it is always a change for the worse to replace packaging made from paper or cardboard with packaging made from plastics that are not biodegradable in landfills.
Which of the following, if true, constitutes the strongest objection to the argument above?

A、 The paper and cardboard used in packaging are usually not biodegradable in landfills.
B、 Some plastic used in packaging is biodegradable in landfills.
C、 In many landfills, a significant proportion of space is taken up by materials other than discarded packaging materials.
D、 It is impossible to avoid entirely the use of packaging materials that are not biodegradable in landfills.
E、 (E) Sometimes, in packaging an item, plastics that are not biodegradable in landfills are combined with cardboard.

【正确答案】 A

【答案解析】[解析] 段落推理为：包装用可生物降解的材料来制造对环境有益，所以用不可生物降解的塑料制造的包装代替纸包装将是一个更糟的变化。上面推理成立依赖的假设是：纸包装是可生物降解的。如果纸包装在垃圾场不能生物降解，正如(A)所说，那么就反对了上面的假设。所以上面推理必不成立，因此(A)正确；(E)仅仅说明不可降解的塑料与纸板配用，但究竟纸板什么属性，并未说出，因此是无关选项。