2. 外语
  3. Very few people could understand the lecture the professor delivered because its subject was very______.

Very few people could understand the lecture the professor delivered because its subject was very______.

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问题 Very few people could understand the lecture the professor delivered because its subject was very______.
选项 A、obscure
B、indefinite
C、dubious
D、intriguing
答案A
解析 四个选项的意思分别是：obscure费解的，模糊不清的；indefinite无限期的，不明确的；dubious可疑的，不可靠的； intriguing令人感兴趣的，有迷惑力的。句意是，几乎没人能听懂教授的讲座，因为这个课题太令人费解了。所以正确答案是A选项，如：The point of his speech is obscure．(他发言的要点模糊不清。)
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