2. 外语
  3. A pilot noticed a balloon which seemed to be【K1】______(make) for a Royal Air Force Station nearby. He informed the station at on

A pilot noticed a balloon which seemed to be【K1】______(make) for a Royal Air Force Station nearby. He informed the station at on

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问题    A pilot noticed a balloon which seemed to be【K1】______(make) for a Royal Air Force Station nearby. He informed the station at once, but no one there【K2】______(be) able to explain the mystery. The officer in the control tower was very angry when he heard the news, because balloons can be a great【K3】______(dangerous) to aircraft. He said that someone might be spying on the station and the pilot was ordered to keep track【K4】______the strange object. The pilot managed【K5】______circle the balloon for some time. He could make out three men in a basket under it and one of them was holding a pair of binoculars. When the balloon was over the station, the pilot saw one of the men【K6】______ (take) photographs. Soon afterwards, the balloon began to descend and it landed near an airfield. The police were called in, but they could not arrest anyone, for the basket【K7】______ (contain) two Members of Parliament and the Commanding Officer of the station!【K8】______the Commanding Officer explained later,【K9】______half of the station did not know【K10】______the other half was doing!
【K4】
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答案of
解析 keep track of为固定搭配，表示“跟踪……”。
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