The natural world teaches us a great deal about recycling (循环再利用). In nature, recycling happens every day. For example, when leaves fall to the ground, they will turn into compost (肥料), helping ____ grow healthily and strong. When an animal dies, it becomes food for ____ animals. Nothing is wasted. But humans have created things like plastic bags ____ can’t be broken down by nature. Our rubbish kills animals and ____ water and soil. ____ we continue making too much rubbish, the problem will only get ____ . If nature can’t reuse the rubbish, we ____ recycle it. We should clean up the rubbish we’ve made because nature can’t.
Recycling is important. In reusing material instead of throwing it away, we can also benefit from it. ____ the Earth is rich in natural materials like water and trees, these materials are not endless. We use up our natural materials much faster than the Earth is able to reproduce them. For example, each year we ____ more than 6,000 square miles of forest. But it ____ an average of 25 years for a new tree to grow.
Recycling can help us save the Earth, so let’s take action right now.

A．animals B．plants C．humans D．river

A．another B．other C．others D．the other

A．who B．which C．what D．where

A．pollutes B．produces C．recycles D．cleans

A．When B．Whether C．Why D．If

A．best B．better C．worse D．worst

A．may B．can C．must D．need

A．Because B．If C．Although D．As

A．break down B．grow up C．cut down D．fix up

A．spends B．costs C．pays D．takes