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在线辅导团队特为考生整理了2013年职称英语考试每日一练，供大家练习，祝考试顺利!请大家可随时关注在线职称英语考试动态栏目，我们将第一时间公布相关考试信息。阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。 Dark Forces Dominate Universe The earth.moon.sun and all visible stars in the sky make up less than one percent of the universe.Almost all the rest is dark matter and dark energy，unknown forces that ______astronomers. Observations in recent years have changed the basic______ of how the universe evolved and have indicated how little is known about the major forces and substances that______ our world Astronomers now know that luminousmatterstars，planets and hot gas----Accounts ______ only about 0,4 percent of the universe.Non-luminous components，such as black holes and intergalacticgas，______ up 3.6 percent The rest is either dark matter , about 23 percent，or dark energy，about 73 percent. Dark matter.Sometimes ______ cold dark matter，has been known for some time.Only recently have researchers come to understand the key role it ______ formation of stars，planets and even people. We ______ our very existence to dark matter, said physicist Paul Steinhardt and a co-author of a review on dark matter which ______ not long ago in the journal Science. | 
