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According to the passage, the "hierarchical" theory of galaxy formation suggests that big,

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The comparative rarity of IOK-1 means that significant changes must have occurred in the universe over the 60 million years that ______.

For this part, you are allowed 30 minutes to write an essay entitled Credit Cards. You should write at least 120 words following the outline given below in Chinese:
1. 信用卡的使用越来越普遍;
2. 两点好处:方便,防盗;
3. 你所持的观点。

快捷方式是一种特殊类型的文件,每个快捷方式都有自己独立的文件名。()

对一台显示器而言,当分辨率越高时,其扫描率将会______。

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