第 1 题 · 六级
The polar bear can survive the freezing cold, which amazes the scientists studying the Arctic.
核心词：polar ˈpəʊlə adj. 极地的，两极的
北极熊能在严寒中生存，这让研究北极的科学家们惊叹不已。
一般现在时情态 + 主谓宾 + which 从句 + 现在分词后置定语短语 a polar bear短语 polar region
The ___ bear can survive the freezing cold, which amazes the scientists studying the Arctic.
第 2 题 · 六级
The tribe has lived in the forest for centuries, passing down its customs from generation to generation.
核心词：tribe traɪb n. 部落，族
这个部落已在森林里生活了几个世纪，一代代传承着他们的习俗。
现在完成时现在完成时 + 现在分词作伴随状语短语 a native tribe短语 tribal customs
The ___ has lived in the forest for centuries, passing down its customs from generation to generation.
第 3 题 · 六级
The pictures are similar, but there are subtle differences between them, which beginners often miss.
核心词：subtle ˈsʌtl adj. 微妙的，细微的
这些图片很相似，但它们之间有细微差别，初学者常常看不出来。
一般现在时并列句(but) + there be + which 从句短语 a subtle difference短语 a subtle change
The pictures are similar, but there are ___ differences between them, which beginners often miss.
