单项选择题


When will the passengers be able to get up again

[A] When an air-hostess says so.
B. When the seat-belt warning sign goes off.
C. When the captain makes another announcement.
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During the 18th century, people disposed their waste in many ways EXCEPT for______.
A．burying it
B．recycling it
C．burning it
D．throwing it into rivers
单项选择题
Travelers by Bel Air know that they will______.
A．see films that they have seen before
B．eat the food that they have never had before
C．have a good rest
D．be best served on the plane
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