1. (2023·温州模拟) 阅读短文，回答问题

Have you ever noticed plastic bags, bottles or cups all on rivers? Have you ever thought about a good method to solve the problem? A bubble* system was presented at the ISEF (International Science and Engineering Fair) in May by a 15-year-old high school student called Dakota Perry. She came up with the idea of creating the system when spending time by the river behind her house.

The bubble system works in a smart way. It sends a curtain* of bubbles up from the river bottom and makes the curtain cross the river in a diagonal* line. Then the rubbish will be stopped in the curtain and pushed towards the side of the river by the natural moving water. There, the rubbish will be easily collected and sent to the rubbish bin. The bubble curtain mainly depends on a machine called air compressor*. It sends air through a plastic pipe* with rows of small holes. The air escapes through those holes and creates what looks like a curtain.

In order to make the bubble system actually work and collect rubbish, Dakota focused on working out how much pressure the air compressor should push out. She kept changing different amount of pressure until a full bubble curtain appeared. She also checked the speed of the moving water after rainstorms and then made sure the bubbles still rose in rushing water. To test the curtain's ability of collecting rubbish, Dakota placed plastic bottles into the water. Some bottles were empty, and others were full of small stones. All of the bottles successfully stopped at the curtain, slowly moved along it, and finally reached the edge of the river.

The bubble system works really well. It can be left on for 24 hours a day. That will certainly save human resources and help the community rubbish pickup to enjoy a shorter working hour. Besides, fish can still swim through the bubbles freely and even get more air from the bubbles.

Dakota never stops trying and testing. Now she is planning to run the air compressor with solar energy and also the power from moving water. That will make her bubble system completely green in the future.

1. （1） The bubble system_______.

   A . was invented in May B . was created by Dakota Perry C . was improved by ISEF D . was presented in a high school
3. （2） Which of the following pictures shows how the bubble system works?

   A . B . C . D .
5. （3） The very important task to make the bubble system work is to________.

   A . find out how fast the bubble curtain moves B . change the pressure to create more bubbles C . check how much energy the air compressor needs D . make sure the bubbles can rise in different situations
7. （4） What can we know about the bubble system from the passage?

   A . It needs to have a shorter working hour. B . It will produce greener energy in the future. C . It creates a better living environment for the fish. D . It makes the bottles with stones fall down the river.