听下面一段材料,回答第1-4题。 1. Why are people interested in vegetable gardening? A. Because people can make money from it. B. Because people can relax themselves. C. Because people can sell vegetables. 2. In what season(s) can a well-kept garden provide fresh vegetables? A. In late autumn. B. From late spring to autumn. C. From spring to late autumn. 3.What is needed to keep the garden well? A. Great efforts. B. A lot of money. C. Little time. 4.What can you learn from Professor Smith? A. Tips on how people grow vegetables. B. Reasons for doing vegetable gardening. C. Kinds of vegetables people prefer.