20. Since the invention of digital readout, machine designers have rushed to replace conventional dials and gauges with digital units. Yet the digital gauge has drawbacks in some situations. Since it presents an exact numeric value, it must be decoded and analyzed by a human operator; its meaning cannot be read in an instantaneous scanning. An analog dial or gauge can be marked with red to alert the operator when a value is entering a danger zone; a digital gauge cannot. And it is difficult to tell whether a digital readout is increasing or decreasing over time, while the up or down movement of a pointer on an analog gauge can be quickly and easily observed.
The author of the passage above would probably recommend the use of digital gauge in cases when
warning of a sudden rise or fall in value is needed
II. an operator must read and interpret several gauges within a few seconds
III. a precise numeric value is essential
(A) I only
(B) III only
(C) I and III only
(D) II and III only（B）
(E) I, II, and III
想不同II为什么对呢？既然 “its meaning cannot be read in an instantaneous scanning”，就说明读起来不快阿，难道a few seconds表明时间很充裕？
不知道理解得对不对啊正是因为its meaning cannot be read in an instantaneous scanning, 所以它的meaning就需要operator来人工analyse啊,要达到和传统的analog dial or gauge一样快,就需要这些operator技艺高超,也就是B的must read and interpret several gauges within a few seconds
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