2. 外语
  3. People did not begin to use unmanned vehicles in undersea exploration until recently because of______. By "more challenging" (P

People did not begin to use unmanned vehicles in undersea exploration until recently because of______. By "more challenging" (P

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问题 People did not begin to use unmanned vehicles in undersea exploration until recently because of______.
By "more challenging" (Para. 6), the author means ______.
选项 A、more interesting
B、more demanding
C、more attractive
D、more’dangerous
答案B
解析 参见第六段第一句，从句子结构推断出，Though undersea exploration is more challenging…，it has a distinct advantage…，though引导从句后的内容与主句的内容相反。
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