2. 外语
  3. The old sailor had never studied navigation, but he had good ________knowledge of it.

The old sailor had never studied navigation, but he had good ________knowledge of it.

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问题 The old sailor had never studied navigation, but he had good ________knowledge of it.
选项 A、periodical
B、tropical
C、empirical
D、vertical
答案C
解析 形容词辨义。本题是修饰knowledge的一个形容词，结合所给的选项：periodical意为“(定期出版的)杂志，期刊，周期性的”，如：learned periodical(学术期刊)；tropical意为“热带的，热情的”，如：a tropical plant(热带植物)；empirical意为“以经验(或观察)为依据的，经验的”，文中讲老水手虽然没有学过航海，但他有着丰富的经验知识，所以此项符合题意，再如：empirical results that supposed the hypothesis(证明假设成立的经验性结论)；vertical意为“垂直的”，如：Walls are usually vertical．(墙通常是垂直的。)
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大学英语六级

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