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You will hear a talk. As you listen, you must answer questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right: You will hear the talk TWICE.
What kind of new technology helped us a lot to study the planets

【参考答案】

Computers and satellites

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You will hear a talk. As you listen, you must answer questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right: You will hear the talk TWICE. What kind of new technology helped us a lot to study the planets 您的浏览器不支持 audio 元素。