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
When a number of people ______ together in a conversational knot, each individual expresses his position in the group by where he stands.
A．pad
B．pack
C．squeeze
D．cluster
单项选择题
Very few people understood his lecture, the subject of which was very ______.
A． obscure
B． upsetting
C． distant D: inferior
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