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unchecked adj.未受制止的, 未经检查的 unlocked adj.显露的 unmeasured adj.不可测量的 13． a) personally b)accurately c)formally d)directly it cannot be seen or detected _13_ ． 13． 分析：借助空格所在的句子大意“它（黑色物质的性质）不能被看见或察觉。。”判断d（直接地）是答案。 personally adv.亲自 14． a)all b)total c)overall d)sum astronomers know it is there because of its effect on celestial objects than can be seen and measured．but the most dominating force of _14_ in the universe is called dark energy, a recently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed． 14． a. 分析：空格处需要名词性的结构，因此排除c（形容词），b和d都是指“总数”在这层含义上是近义词，但前面应该有定冠词the, 如：what does the total/ sum come to?（总数是多少？），因此判断b和d都不是答案，答案应该是a。 15． a)when b)that c)how d)what one scientist said it is clear now _15_ dark matter and dark energy engaged in a gravitational tug of war that，eventually，dark energy won． 15． 分析：被选项是连词，因此注意整个句子的语法结构和句意。空格处所在的从句结构在句子中作主语从句，而从句所在的结构大意是“黑色物质和黑色能量参与了最终黑色能量获胜万有引力上的拔河比赛，而最终黑色能量获得了胜利。” 借助该结构含义判断b是答案。  |
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