Chemicals in the body ______our food _____ into useful things．
A．break, intoB．break, upC．break, downD．break, off
C
考查短語辨析。break into 破門而入，break up 解散，break down 分解，break off 中斷，句意：身體中的化學物質(zhì)把我們的食物分解成有用的東西。所以選C。
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