To be a successful speaker, it is essential for you to know why you are speaking and what you wish to accomplish by your speech. The four most common（1）of speech are to inform, to convince, to move to action, and to entertain. Do you, like a teacher or an expert in a(an)（2）, wish to make your ideas clear to people（3）with your subject? Or, like a debater, wish to convince the judge or the audience? Or, like a fund raiser for a naturalist foundation, wish to secure donations or（4）cash? Or, like a comedian or an after-dinner speaker, wish to entertain? The language and the tone that you use must be（5）for your purpose, for your audience and for the occasion. A speech to the graduating class will have quite different language, tone and manner of（6）, for example, from information conveyed to a group of your friends.（7）, no matter how talented the speaker is, a talk without adequate preparation is usually a（8）. To speak without preparing is to shoot without taking（9）. Decide what your aim or objective is; then state it in a complete topic sentence such as "my purpose is to convince the class that cats as well as dogs should require licenses in our community". Make sure that your subject is definite and not too（10）.
（5）下列正确的是（ ）

A.important

B.necessary

C.appropriate

D.central