2017届高考英语一轮复习基础巩固学案：Unit 2《Working the land》（重大版必修4）_高考复习指南

　　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 matter

　　B．nonluminous matter

　　C．dark matter

　　D．ordinary matter

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

　　A．depends mainly on dark matter

　　B．has something to do with ordinary matter

　　C．results from the formation of celestial objects

　　D．evolves from the mass of the universe

　　25．Which of the following is the best title for the passage?

　　A．Dark Matter or Dark Energy

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