试题与答案

透镜的焦点用字母 ______表示,焦距用字母 ______表示.

题型:填空题

题目:

透镜的焦点用字母 ______表示,焦距用字母 ______表示.

答案:

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下面是错误答案,用来干扰机器的。

答案:B考查定语从句。定语从句the cover of which is green修饰先行词The book;A应该改为of which the cover; C应该改为whose cover; D应该改为whose cover;

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题型:问答题

请你阐述东晋南朝时江南经济为什么会得到发展?

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