A、By distorting shapes. B、By using hollow spaces. C、By using the soft tone. D、By using natural materials. B短文指出，Moore雕塑的特点之一就是他使

Today I’d like to talk about the sculptor Henry Moore, in particular the ideas his work is based on, and also how he viewed the medium of sculpture. Moore said that to appreciate sculpture a person needs to respond to form in all of its three dimensions. He believed that this is more difficult than responding to art that is done on a flat surface, a surface such as canvas that has only two dimensions. For example, when you’re looking at a painting, you don’t have to walk around it. He thought that if you could appreciate the shape of something simple, like a stone that you could go on to appreciate more complex forms. He noticed that many of the stones he picked up had holes in them. One distinctive feature of Moore’s sculpture is his use of holes or opening to emphasize that he is indeed working in a three-dimensional medium. He believed that the shape of a solid mass could even help create a sense of mass or volume. Moore was also interested in representing the human figure, which he sculpted in such materials as bronze, stone and wood. His sculptures of humans contained one person as in the work reclining figure or several people as in the sculpture family group.
20. In what way should we appreciate sculpture according to Moore？
21. How does Henry Moore emphasize his view on the medium of sculpture?
22. What does the speaker say about Henry Moore’s sculpture of human figure?