Not everyone has realized what important part the balance of nature plays in their life.
A. an；the
B. /；the
C. an；/
D. the；/
网友回答
A. an；the
B. /；the
(答案→)C. an；/
D. the；/
解析：考查冠词及短语的用法。第二空nature“自然”时前面不需用冠词，类似的还有space“太空”；man“人类”。第一空是play an important part in their life短语，用了what引导的感叹句，正常语序应是the balance of nature plays an important part in their life，被感叹的是名词part所以用what来引导，故选C。用how来感叹形容词或副词。