A specific purpose starts with one of the three general purposes and then specifies the actual topic you have chosen and the basic objective you hope to accomplish with your speech. Basically, the specific purpose answers the who, what, when, where, and why questions for your speech.
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“The importance of morning reading” is not an effective central idea because it is expressed in a phrase.
A. 对
B. 错
“Is it necessary to ban smart phones in class?” is not an effective central idea because it is too general.
A. 对
B. 错
“Wang Xizhi’s calligraphy is awesome.” is not an effective central idea because it uses figurative language “awesome”.
A. 对
B. 错
The sentence “Charles Baudelaire is a great poet.”conveys the main idea clearly and sharply.
A. 对
B. 错