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Yang Jun’ao, a 16-year-old student from No. 1 Middle School in Nanxian County, Hunan Province, invented a “lotus root harvesting robot (采藕机器人)”.

“I got the idea when I saw my grandmother, in her 70s, working hard to harvest lotus roots under the hot sun,” Yang said. Sometimes, his grandmother would badly hurt her fingers using her harvesting tools.

To make things easier for his grandmother, Yang thought of creating a machine that could automatically (自动地) harvest lotus roots. With help from his teacher Hong Wei. Yang spent nearly a year building a model of the machine. The robot moves on its own through the muddy field. It uses image recognition (识别) to find roots that are ripe (成熟的) by looking at the color of the lotus leaves. The robot’s arm then cuts the lotus roots without hurting them.

During the invention process, Yang faced challenges like collecting parts for the model, putting them together and using a hot glue gun for bonding. “The first time I used a hot glue gun, my hands were shaking,” Yang laughed. At first, he planned to use rotating blades (旋转叶片) for harvesting lotus roots, but it was hard to find them, so he used more common blades instead.

When Yang showed the machine to his grandmother, she was happy and gave helpful suggestions for improvement. She suggested using the audio player to show the machine’s location in dense (稠密的) lotus leaves. “My grandmother’s advice reminded me that any technological invention must be practical to have true value,” said Yang.

Although Yang still needs to make improvement, like finding cheaper ways to make the machines, his teacher Hong praised Yang’s creative thinking and dedication (致力) to helping his hometown.

根据短文内容，选择最佳答案。
1．Why did Yang invent the lotus root harvesting robot?

A．Because he could use it when he worked in the field.

B．Because he needed to do something with his teacher.

C．Because he wanted to make his grandmother’s work easier.

D．Because be was interested in trying something new.

2．What difficulty isn’t mentioned during the invention process?

A．Collecting parts for the model.	B．Putting all the parts together.
C．Using a hot glue gun for bonding.	D．Spending nearly a year finishing the work.

3．What does the underlined word “practical” in the passage probably mean?

A．Expensive.

B．Useful.

C．Enjoyable.

D．Challenging.

4．Which is the right order of Yang Jun’ao’s experience?
① Yang decided to invent an automatic machine.
② Yang’s grandma had to work under the hot sun.
③ His grandma was very happy and gave him some good advice.
④ He would work hard to improve the machine.

A．①③②④

B．①③④②

C．②①④③

D．②①③④

5．What could be the best title of the passage?

A．A creative invention.	B．A smart grandmother.
C．A brave boy.	D．A hard job.