单项选择题

Which of the following is NOT included in the present space tourism

A．Visits to museums.
B．Visits to space camps.
C．Visits to rocket-launch recovery sites.
D．Low-gravity aircraft trips.
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单项选择题
The main idea of the passage is ______.
A．facing life's tests and difficulties with courage
B．the progress of human civilization
C．the importance of children’s learning to cooperate with others
D．the early education of children
单项选择题
Cooperation can cure the following EXCEPT ______.
A．lack of interest in others
B．selfishness
C．independence
D．lack of social feeling
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