单项选择题

The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.

A．initiated
B．originated
C．embarked
D．commenced
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单项选择题
Buck Helm, a retired salesman, survived ______ alive for 90 hours in his car.
A．burying
B．having buffed
C．being buffed
D．to be buried
单项选择题
If the world is to remain peaceful the utmost effort must be made by nations to limit local ______.
A．collisions
B．combats
C．contradictions
D．conflicts
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