单项选择题

What do you know about the flight at 8:30

A. The tickets were sold out.
B. Its take-off time has been changed.
C. The plane is too crowded.
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单项选择题
What are in the sky in the boys’ picture
A. A tree.
B. A plane.
C. His mother and green trees.
单项选择题
Why colors of national flags are different
A. To tell from each other.
B. For particular meaning.
C. To show colors’ functions.
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