Before takeoff, air hostesses routinely ( ) the
passengers' safety on board.
A: check on
B: carry on
C: concentrate on
D: center on
passengers' safety on board.
A: check on
B: carry on
C: concentrate on
D: center on
举一反三
- 词汇与结构 Before takeoff, the engines, particularly piston engines, are routinely run up at high power to check for ________ problems.
- All passengers ________ go through safety check before they take a plane. A: can B: may C: must D: could
- The position of the stairs or air bridge should ____ for safety before landing. A: check B: checks C: be checking D: be checked
- Passengers must _____________ at the airport an hour before the train leaves. A: check out B: check in C: checking D: check over
- 中国大学MOOC: Passengers can carry liquids on board with a limit of less than100ml for the container.