问题
单项选择题
There are two general rules for giving instuctions; they must be kept as simple as possible, and they must be（）.
A．logical
B．feasible
C．authentic
D．natural
答案
参考答案：A
解析：
说明的原则有两个，第一是尽量简略，第二是有逻辑性。故选A。
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