单项选择题

How many astronauts will be on board

A．2
B．3
C．4
D．5
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What will the speakers probably do next
A．Write their lab reports.
B．Find out Professor Smith’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.
单项选择题
When did NASA first sent astronauts to the moon
A．30 years ago
B．31 years ago
C．32 years ago
D．33 years ago
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