2. 专升本
  3. By moving the radar beam around slowly in circles, we can ______ the surroundings.

By moving the radar beam around slowly in circles, we can ______ the surroundings.

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问题 By moving the radar beam around slowly in circles, we can ______ the surroundings.
选项 A、explore
B、expose
C、exploit
D、expand
答案A
解析 explore“探测，探究”；exploit“开发，利用”；expand“膨胀”；expose“揭露，暴露”。     
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