Questions 1-4 Reading Passage 1 has six paragraphs A-F. Choose the most suitable headings for paragraphs B-E from the list of he

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问题 Questions 1-4
Reading Passage 1 has six paragraphs A-F.
Choose the most suitable headings for paragraphs B-E from the list of headings below.
Write the appropriate numbersⅠ--Ⅸ in boxes 1-4 on your answer sheet.
      List of Headings
Ⅰ  How the reaction principle works
Ⅱ  The impact of the reaction principle
Ⅲ  Writers’ theories of the reaction principle
Ⅳ  Undeveloped for centuries
Ⅴ  The first rockets
Ⅵ  The first use of steam
Ⅶ  Rockets for military use
Ⅷ  Developments of fire
Ⅸ  What’s next?

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