Q: How many hours is the flight from Toronto to Beijing? A: 18 hours B: 28 hours C: 20 hours D: 19 hours

They cleaned their classroom ____ . A: three hours B: on three hours C: three hours ago D: three hours later

Part I: Listening Comprehension (15%) A: 40 hours B: 47 hours C: 49 hours D: 50 hours

How many hours before the departure should you call to ask for cancellation of your flight？ A: 10 hours B: 12 hours C: 18 hours D: 24 hours

47. How many hours will the applicants work each week? A: A. 16 hours B: B. 18 hours C: C. 20 hours D: D. 24 hours

 I cleaned my classroom ___________. A: with three hours B:  three hours ago C: in three hours D: three hours before

According to Dr. David, Americans ______. A: are ideally vigorous even under the pressure of life B: often neglect the consequences of sleep deficit C: do not know how to relax themselves properly D: can get by on 6.5 hours of sleep

Which of the following is Dr. David's opinion A: People who think they are sleeping enough are better off than those who don't. B: Some people can remain vigorous with only 6.5 hours' sleep a night. C: If they get 8.5 hours' sleep, people will be full of drive and ambition. D: People's mental power suffers if they are in sleep deficit.

It takes ______ to produce the first tank top by using 3D printer. A: 28 hours B: 14 hours C: 7 hours D: 2 hours

How long is the accident non-intervention time of passive safety technology？ A: 30 hours B: 12 hours C: 24 hours D: 72 hours