听下面一段材料,回答第1至4题。 1. When will the visitors come? A. In March. B. In April. C. In May. 2. How many visitors are coming? A. 8. B. 10. C. 12. 3. What will the visitors do on the second day? A. Go to a party. B. Visit schools. C. Attend a lecture. 4. Where will the visitors go on the final day? A. To London. B. To Scotland. C. To the coast.