单项选择题

油井的产量越高，油井的探测半径就
A、越大
B、越小
C、不变
D、都不是

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单项选择题
A persuasive speech is aimed to do all the following except _____. A、upgrade on the listeners’ power of understanding B、change the opinion of an audience C、convince the audience to change their mind D、make the listener see the necessity of a new decision
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