单项选择题

John said that he didn't quite（）and asked me to repeat what I had said.

A．snatch up
B．summon up
C．catch on
D．watch out

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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

单项选择题

It can be inferred from the passage that high-quality college education calls for（）

A．putting academic work in the proper context
B．a commitment to students and effective teaching
C．the practice of putting learning to productive ends
D．dedication to research in frontier areas of knowledge