题目内容

Many chemical substances react________oxygen.
A．onB．withC．againstD．to
B
答案　B　[考查短语。react to 对……产生反应；回应，对应； react vt.& vi.指物质起化学反应常与with连用。 react against sth/sb反对，反抗；  react on/upon sb/sth 对……起作用，有影响。]
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