在托福阅读备考的练习中，想要快速的提升自己的托福阅读能力，除了不断的累积自己的词汇和句型之外，从TPO练习入手也不失为一个不错的方法。那么，在以下内容中，我们就为大家带来TPO5托福阅读词汇，希望能为大家托福阅读备考带来帮助。
Paragraph 1: The geologic timescale is marked by significant geologic and biological events, including the origin of Earth about 4.6 billion years ago, the origin of life about 3.5 billion years ago, the origin of eukaryotic life-forms (living things that have cells with true nuclei) about 1.5 billion years ago, and the origin of animals about 0.6 billion years ago. The last event marks the beginning of the Cambrian period. Animals originated relatively late in the history of Earth—in only the last 10 percent of Earth’s history. During a geologically brief 100-million-year period, all modern animal groups (along with other animals that are now extinct) evolved. This rapid origin and diversification of animals is often referred to as “the Cambrian explosion.” 【TPO5- The Cambrian Explosion】
1. The word “significant” in the passage is closest in meaning to
○ numerous
○ important
○ unexplained
○ sudden
2. The word “relatively” in the passage is closest in meaning to
○ surprisingly
○ collectively
○ comparatively
○ characteristically
3. The word “diversification” in the passage is closest in meaning to
○ emergence of many varieties
○ steady decline in number
○ gradual increase in body size
○ sudden disappearance
答案：(2)(3)(1)
