43. switches
[点拨]空格前是the unseen，可见空格为名词。前面的句子交代了有些开关是可见的，有些是不可见的，所以这里应该是不可见的开关switches。
44. We know the train will take one of the tracks leading out, but we have no idea which one
[听音关键词]know，train，take tracks，no idea，which one
45. When we think about the future of the universe, we can see our "track" many billions of years into the future
[听音关键词]think about，future of universe，see track，billions
46. The goal of science is to reduce the vagueness at the decision points and find the true road that will be followed
[听音关键词]goal of science，reduce vagueness，find true road
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