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

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

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问题 The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.
选项 A、initiated
B、originated
C、embarked
D、commenced
答案D
解析 句意：太空时代开始于1957年10月，那时候第一个人造卫星由苏联发射上空。 initiate是个及物动词，“开始，发起，倡议”，如initiate a constitutional amendment提出宪法修正案；originate作及物动词意为“发源，来自，产生”，作不及物动词时，意为“引起，创始，发明”；embark on意为“从事(飞机，汽车)，发动，着手”；commence意为“开始，着手”，既可作及物动词，又可作不及物动词。
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