The nature of dark matter is unknown.It cannot be seen or detected directly.Astronomers know it is there because of its effects on celestial(天上的) objects that can be seen and measured.But the most dominating force of all 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.

　　21．We know from the text that ________.

　　A．all visible stars are very important in the universe

　　B．the basic understanding of the universe evolution was totally wrong

　　C．dark matter is also known as dark energy

　　D．dark energy makes up about three quarters of the universe

　　22．The text tells us “dark matter” ________.

　　A．plays an important part in forming stars，planets and humans

　　B．has been fully understood by researchers

　　C．remains an unimportant force to the universe like dark energy

　　D．has nothing to do with the formation of the universe today

　　23．“The major forces and substances that shaped our world” (in Para.2) refers to _______.

　　A．luminous matterB．non-luminous matter

　　C．dark matterD．ordinary matter

　　24．According to Paul Steinhardt，our existence today ________.

　　A．depends mainly on dark matter

【2016高考英语一轮复习 Unit2《Working the land》知能达标训练 新人教版必修4】相关文章：

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 4 A卷 Word版含解析

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 2 B卷 Word版含解析

★ 2014届高考英语一轮复习课时作业(三十三)选修6Module 3《Music》（外研版）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (33)

★ 四川省2016届高考英语一轮复习课时作业（27） Module 3 Adventure in Literature and the Cinema 外研版必修5

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (82)

★ 2017届高考英语二轮复习课时训练：19（含解析）

★ 北京市2014高考英语一轮复习 练习手册（40）选修8 Unit 5 Meeting your ancestors（含解析）新人教版

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (52)

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (62)