填空题

Who sent unmanned spacecrafts to the moon in the 1950s and 1960s

【参考答案】

Russian and American scientists.
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单项选择题
When will the boy probably act
A．He receives the instruction from computers.
B．He receives the instruction form human beings.
C．He can judge the meaning from the ambiguous words.
D．He can tolerate the interactions of human beings.
填空题
______ discovered liquid fuel as a fuel for rockets.
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