题目内容：

Inventor Creates Wheels That Let Cars Roll in Any Direction

Omnidirectional wheels have been around for a while, but they are mostly used on utility(实用的) vehicles like forklifts. london-based inventor William Liddiard has created a special set of all-around wheels that can be bolted on to any car, allowing it to move in any direction, spin 360 degrees and slide into a parallel park with ease.

"Unlike other all-around capable wheels, my wheels do not require the vehicle to be built around them. This is a world first bolt-on application for anything with wheels." Liddiard wrote in the description of a You Tube video he uploaded to show how his invention works on an old Toyota Echo. "They are stronger, faster, and more accurately controlled than previous technology. They can take a beating. The tires can have the same build characteristics (siping, grooves, rubber compounds etc.) as regular tires. Now you can drive in all directions, and tum on the spot, when needed."

While the "Liddiard Wheels" shown in the video are just proof of concept prototypes(原型机), they seem to work as described by the inventor. His car can be seen spinning in place and sliding from one side to the other as the tires move under the power of 24,000 pounds of torque (扭矩) applied directly to them.

William is now hoping that the power of social media will help him get his invention out there and eventually team up with a company willing to help him improve the wheels and eventually bring them to the market.

" Will a set of wheels make sideward parking an easy thing? Yeah, I’m pretty sure these things will be in high demand if they ever end up on the market." the inventor said confidently.

1.What does the underlined word "bolted" in Paragraph I mean?

A. Changed.

B. Loaded.

C. Designed.

D. Fastened.

2.What do the newly-invented and the traditional wheels have in common?

A. They use the same tires.

B. They have the same structure.

C. They are made in the same way.

D. They are accurately controlled.

3.Why did the inventor post the information of his invention online?

A. To explain its advantages.

B. To seek a cooperator for it.

C. To challenge traditional wheels.

D. To show off his great achievements.

4.What did the inventor think of his wheels?

A. Interesting.

B. Convenient.

C. Promising.

D. Priceless.