题目内容
( ) Fluorine is a toxic and corrosive gas and, at high concentrations, can _____ plant growth and damage teeth and bones.
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( ) Numerous researches have found that 90% of youth who died by suicide had at least one _____ disorder.
( ) As illness is often aggravated by _______, doctors strongly recommend that patients keep optimistic.
( ) To school children, study is something that should be given first ______ to.
( ) The great difficulties the two friends have overcome through joint efforts have created a special _____ between them.
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