There are 800 runners in a marathon（马拉松）. The mean（平均的）running time is 4 hours exactly. Which of the following must be true?
A: Half the runners take more than four hours.
B: Most people take four hours.
C: The total time taken is 3,200 hours.
D: Everyone takes four hours.
A: Half the runners take more than four hours.
B: Most people take four hours.
C: The total time taken is 3,200 hours.
D: Everyone takes four hours.
C
举一反三
- 7. How many hours a day of sleep does the doctor recommend? A: Six or seven hours B: Nine or ten hours. C: Four or five hours.
- “火车晚点了四个小时。”可以用以下哪些英语句子表达？ A: The train runs four hours. B: The train was four hours behind schedule. C: The train was late for four hours. D: The train was delayed for four hours.
- Two hours (be) ____________ a short period of time during the working hours.
- How many hours can international students work during school breaks? A: Twenty hours B: More than twenty hours. C: Thirty hours. D: Not mentioned
- If you have 20 pages to be typed, how long does it take to get them finished A: More than 48 hours B: More than 24 hours. C: Within 24 hours. D: In 24 minutes.
内容
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Questions 4-8 What’s the difference of the time zone between New York and Paris？（） A: Six hours: B: Seven hours. C: Eight hours. D: Nine hours.
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3. How many hours of exercise in a week is advised by the speake A: At least two hours. B: At least two and a half hours. C: At least three hours. D: At least three and a half hours.
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For how many hours is the art exhibition open（） A: Eight hours. B: Seven hours. C: Nine hours. D: Ten hours.
- 3
How many hours does his father work on Saturdays A: Five hours. B: Six hours. C: Seven hours. D: Two hours.
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How many hours on average do Americans read a week according the survey? A: 10.7 hours. B: 4.1 hours. C: 3.1 hours. D: 5.35 hours.