计算股票价值的贴现率应当是投资者要求的收益率，可根据股票历史上长期的平均收益率来确定；也可以参照债券的收益率，加上一定的风险报酬率来确定；更常见的方法是直接使用市场利率。 ()
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A．holdB．fixC．retainD．keep
A. hold
B. fix
C. retain
D. keep
What does "the process" appearing in the last paragraph refer to？
A. Pairing up successful instructions.
B. Sending instructions to the robot.
C. Generating new sets of instructions for evaluation.
D. All the above.
A．legallyB．libraryC．literallyD．liberty
A. legally
B. library
C. literally
D. liberty
A．Can I？B．Of course.C．Get on.D．Please don't.
A. Can I？
B. Of course.
C. Get on.
D. Please don't.
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