Scarce resources include labor hours.
举一反三
- Scarceresources include labor hours.
- For how many hours is the art exhibition open（） A: Eight hours. B: Seven hours. C: Nine hours. D: Ten hours.
- How many hours does his father work on Saturdays A: Five hours. B: Six hours. C: Seven hours. D: Two hours.
- 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.
- 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.