【单选题】According to the passage, recorded history has taught us ______.
A.
violence never solves anything
C.
the bloodshed means nothing
【单选题】Each of us has _______ life goals, which will guide us to a bright future. Without life goals, we may waste our lifetime. [ ]
【单选题】One of the great things about science is that it has taught us to be __________ about surface appearances. The world seems flat, but it is, in fact, round.
【单选题】Each of us has __ _ life goals, which will guide us to a bridge future. Without life goals, we may waste our lifetime.