19.听第10段材料,回答第17至20题.
17.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.
18.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.
19.How should a speaker make eye contacts with the audience?
A.By looking at a direction at a time.
B.By looking at a particular person at one time.
C.By looking at the audience all the time.
20.What should a speaker avoid while giving a speech?
A.Having more attention on the audience.
B.Reading the speech to the audience.
C.Raising the voice and using facial expressions.