请听下面一段材料，回答第1-4题。 1. Who is Frank Stone? A. A friend of the woman’s. B. A visitor to the clinic. C. A patient of Dr. Milton’s. 2. Why won’t Mr Stone come to the clinic tomorrow? A. The clinic will be closed. B. Dr. Milton won’t come to work. C. He can’t spare the time. 3. When is the clinic open in a week? A. During the whole week. B. On weekdays except Thursday. C. From Monday to Friday. 4. When will Mr Stone see Dr. Milton? A. At 6:15 pm on Wednesday. B. At 6:15 pm on Thursday. C. At 5:30 pm on Wednesday.