16 A) The importance of sleep to a healthy life. 17 C) They get less and less sleep. 18 D) Their blood pressure will rise. 19. B) What course you are going to choose. 20. D) The personal statement.
21. C） Indicate they have reflected and thought about the subject. 22. B) It was built in the late 19th century. 23. D) They often broke down.
24. A) They were produced on the assembly line. 25. C) It marked a new era in motor travel.
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