ks5u英语知识点优化训练：Unit 5 Canada ---“The True North”

该优化训练是针对新人教版必修3的Unit 5 Canada ---“The True North”出题的，主要考察学生的基础知识，从单词拼写、单项选择、翻译等方面进行考察，难度适中。

I．单词拼写

1. There are 5 to 7 c________ in the world, depending on how you count them.

2. Though it was an e________ difficult task, they finished it in time.

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