单项选择题

In 1984, President Ronald Reagan proposed that the United States construct a launch laboratory for a new era of space exploration.

A．probing
B．revenge
C．invasion
D．expansion
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单项选择题
Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.
A．insane
B．infectious
C．foreign
D．poisonous
单项选择题
Both a person's heredity and his environment help to shape his character.
A．relative
B．education
C．nationality
D．surroundings
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