听下面一段材料，回答第1-4题。 1.What is the purpose of practicing a speech loudly? A. To focus on the material. B. To memorize the speech. C. To give the speech smoothly. 2. What if a speaker makes mistakes at the beginning? A. It is unlikely for him to finish the speech in time. B. He might not be able to continue easily. C. The audience may lose confidence in him. 3. How should a speaker make eye contact with the audience? A. By looking at a different section from time to time. B. By looking at a particular person at one time. C. By looking at the audience all the time. 4. What should a speaker avoid while giving a speech? A. Having more attention on the audience than on the material. B. Reading the speech to the audience. C. Raising the voice and using facial expressions.