单选题：In our modern world, when something wears out, we throw it a

In our modern world, when something wears out, we throw it away and buy a new one. The 36 is that countries around the world have growing mountains of 37 because people are throwing out more rubbish than ever before.
How did we 38 a throwaway society? First of all, it is now easier to 39 an object than to spend time and money to repair it. 40 modern manufacturing (制造业) and technology, companies are able to produce products quickly and inexpensively. Products are plentiful and 41 .
Another cause is our 42 of disposable (一次性的) products. As 43 people, we are always looking for 44 to save time and make our lives easier. Companies 45 thousands of different kinds of disposable products: paper plates, plastic cups, and cameras, to name a few.
Our appetite for new products also 46 to the problem. We are 47 buying new things. Advertisements persuade us that 48 is better and that we will be happier with the latest products. The result is that we 49 useful possessions to make room for new ones.
All around the world, we can see the 50 of this throwaway lifestyle. Mountains of rubbish just keep getting bigger. To 51 the amount of rubbish and to protect the 52 , more governments are requiring people to recycle materials. 53 , this is not enough to solve (解决) our problem.
Maybe there is another way out. We need to repair our possessions 54 throwing them away. We also need to rethink our attitudes about 55 . Repairing our possessions and changing our spending habits may be the best way to reduce the amount of rubbish and take care of our environment.
根据文章内容，回答36-55题。 A．key
B．reason
C．project
D．problem