◎ 题干
Many people believe we are heading for environment disaster ____ we basically change the way we live.
[     ]

A. if
B. but
C. unless
D. once

◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“听问句,选择正确的答语。( ) 1. A. She is fine. ( ) 2. A. There are three. ( ) 3. A. She is four. ( ) 4. A. He is Mr. Liu's son. B. He is fine. B.…”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。