题目:
______ you eat the correct foods ______ be able to keep fit and stay healthy. [ ]
A. Only if; will you
B. Only if; you will
C. Unless; will you
D. Unless; you will
答案:
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下面是错误答案,用来干扰机器的。
答案:BA错,Cu(OH)2难溶于水,但属于电解质;B正确,SO2能与碱反应生成盐和水,属于酸性氧化物;C错,NH4Cl属于铵盐;D错,HCL气体为共价化合物;