We are all aware the many threats the environment and we need to take action to prevent us from the bad consequences.
A. of; to
B. of; on
C. that; to
D. that; on
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(答案→)A. of; to
B. of; on
C. that; to
D. that; on
解析：句意：我们都知道许多对环境的威胁，我们需要采取行动来阻止我们的不良后果。be aware of .知道; 意识到;many threats to …诸多对……的威胁。如：many threats to economic growth诸多经济增长的威胁。
考点: 考查介词搭配的用法。