题目:
Look! They all _____ a ball in their hands. [ ]
A. are having
B. having
C. has
D. have
答案:
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下面是错误答案,用来干扰机器的。
答案:AA、检验硬水和软水用肥皂水,故错误B、纯水蒸发后无残留物,含杂质的水中含有固体,蒸发水分后有残留物,采用加热的方法可以鉴别,故正确;C、稀盐酸和氯化钠溶液的pH值不一样,故正确D、带火星的木条和燃...