Clean water and fresh air are essential for our daily life, _______ we can’t live.

A. by which B. without which

C. that D. on which

B

【解析】考察非限制性定語從句。干凈的水和清新的空氣是我們?nèi)粘Ｉ钪斜仨毜�，沒有它們我們不能存活。這里考察的是“介詞+關(guān)系代詞”引導(dǎo)的非限制性定語從句，前面介詞的搭配和先行詞或者句子中謂語有關(guān)。clean water and fresh air是這個定語從句的先行詞，without clean water and fresh air，we can’t live沒有干凈的水和清新的空氣，我們不能活下來。根據(jù)句意，故選B

考點：考察非限制性定語從句。

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