单项选择题

How many astronauts will be on board

A．2
B．3
C．4
D．5
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单项选择题
NASA announced this week that it plans to ______.
A．develop a new spaceship
B．enlarge its research field
C．send astronauts to the moon
D．cut down its expenses in space research
单项选择题
What is one reason Canadians began to immigrate to Maine during the 1800s
A．Maine was less influenced by the French government.
B．Maine had better employment opportunities.
C．Maine was politically stable.
D．Marine had a better climat
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