Many chemical substances react________oxygen.
A．onB．withC．a(chǎn)gainstD．to
B
答案　B　[考查短語(yǔ)。react to 對(duì)……產(chǎn)生反應(yīng)；回應(yīng)，對(duì)應(yīng)； react vt.& vi.指物質(zhì)起化學(xué)反應(yīng)常與with連用。 react against sth/sb反對(duì)，反抗；  react on/upon sb/sth 對(duì)……起作用，有影響。]
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