You have to be careful when throwing away wet waste, which may include food or other kinds of garbage. Maybe these kinds of waste have made a big mess when you’ve thrown them away before.  
Shi Yuan, 14, from Shanghai Wenlai Middle School, has made a special bag to solve this problem. The plastic bag has a band of adhesive tape (粘贴带). When one end of the tape is open, the bag can be turned upside-down. You can hold the bottom end and easily throw wet garbage into a trash can. Shi came up with the idea after an unpleasant experience in which he got wet waste all over his pants while throwing it away. He found that many other people had the same problem. He became determined (下定决心的) to solve this issue and invented his special bag. 
He first thought about using a gunny (麻布) bag or placing a bag break on his trash cans. But neither of these ideas worked. So he decided to just design his own garbage bag. “I didn’t want to put any extra burden (负担) on the bag, so I used adhesive tape,” Shi said. 
However, the original bag was a one-off product (一次性产品) and not environmentally friendly. So Shi kept on improving his design. He remembered reading about the adhesive used for Post-it notes (便利贴). Shi thought this weak glue (胶水) could be used for the adhesive tape and allow the garbage bag to be reused.
Shi’s bag has become popular in many communities. He has already sold 2 million bags online. His father is quite proud of him. 
“Kids like to play. Shi just changed the way he ‘plays’ and put his mind toward exploring a way to make life easier,” Shi’s father said.
1. Shi’s bag makes it easier to _____.
A. find one-off products
B. clean garbage cans 
C. throw away wet waste
D. throw away plastic
2. Shi decided to design the bag because _____.
A. he thought he could make money
B. he thought plastic bags were too expensive
C. he wanted to design a recyclable bag 
D. common waste bags caused him trouble
3. Paragraph 5 explains _____.
A.why Shi used a gunny sack to make the bag
B. why Shi’s bag is better than common bags
C. how Shi’s bag helped with his problem
D. how Shi made his bag environmentally friendly
4. What do we know about Shi from the story?
A. He won a prize for his own creation.
B. He likes to play rather than study.
C. His father didn’t support his work.
D. His creation has helped a lot of people.

  CDDD