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Answer the questions（根据短文内容回答问题）

Three years ago, Cash Daniels was walking on a beach when he found some plastic. He started thinking about the effect plastic pollution has on the environment, especially on rivers and oceans. That’s when he got interested in environmental issues.

Cash, now 12, found that rivers are at the heart of the problem. A report in Science Advances said that far more rivers are carrying large amounts of plastic into our oceans than was once thought. This news hit close to home for Cash. He lives in Chattanooga, Tennessee. The city sits on the Tennessee River. It’s one of the most polluted rivers in the world. This information led Cash to take action. He made it his mission to clear garbage from public spaces and waterways.

At first, Cash and his parents worked to pick up garbage near the Tennessee River. But soon he realized he would need more help. So he organized community cleanup outings. Eventually, he and other volunteers removed more than 11,000 pounds of garbage from the river. Cash has also partnered with businesses to recycle plastic bottles and cans. He has recycled more than 2,000 pounds of them. The money he earned from that supported river protection efforts. Cash loves sea animals. By cleaning waterways, he helps protect these creatures.

He also set up fishing-line recycling containers(容器) along the Tennessee River. People can throw away their fishing line in these instead of in the water, where it entangles(缠住) wildlife.

Cash enjoys getting other kids involved in these activities. He wrote a children’s book called One Small Piece. It’s about pollution in waterways and oceans. Cash also co-founded the Cleanup Kids. The group encourages children not to throw away anything that can be recycled. “Kids may be small percentage of the population,” Cash says, “but they are 100% of the future.”

1．Cash got interested in environmental issues when he was 9, didn’t he?
______________________________
2．What did Cash decide to do when he knew about the Tennessee River?
______________________________
3．Who did Cash work with at first when picking up garbage near the Tennessee River?
______________________________
4．What does the underlined word “that” in the third paragraph refer to?
It refers to “______________________________”.
5．Why did Cash set up fishing-line recycling containers along the Tennessee River?
______________________________
6．What is the implied(隐含的) meaning of the underlined sentence in the last paragraph?
______________________________