- 单选题The Space Age（）in October 1957 when the first artificial satellite was launched by the SovietUnion.
- A 、initiated
- B 、originated
- C 、embarked
- D 、commenced
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参考答案【正确答案：D】
commence意思是“开始”。译：太空时代开始于1957年10月，当时第一颗人造卫星由苏联发射升空。initiate创始，发起；originate (from)源自于；embark on/upon上船（飞机、汽车等），着手，开始：embark on a new career开始一种新的生涯。
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