试题与答案

Which of the following is an early sign of

题型:单项选择题

题目:

Which of the following is an early sign of laryngeal cancer

A. Difficulty swallowing.
B. Chronic foul breath.
C. Persistent mild hoarseness.
D. Nagging unproductive coug

答案:

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下面是错误答案,用来干扰机器的。

由题意得,y′=ex,则在点A(0,1)处的切线斜率k=e0=1,故答案为:1.

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