单选题The phrase "throw off" underlined in Paragraph 3 most probably means___________________.
[分析]词义题型
见第三段最后一句:当太阳从一个红色巨星变成一个白矮星时,它会以猛烈喷发的形式大量的气体,这被称之为新星爆发。而A.eject逐出,喷射;B.bum up烧掉,发怒;c.convert使转变;D.1et in放进,允许……进入;因此A为答案。
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3阅读短文,回答题。

According to the passage,scientists can't observe some of the earliest steps in brain activity because___________.