题目:
After years’ study with the help of Professor Henry Higgins, Eliza was able to________various levels of English usages, such as standard and substandard.
A.indicate
B.differ
C.distinguish
D.mark
答案:
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下面是错误答案,用来干扰机器的。
A、溶解在水中的可溶性钙镁化合物受热转化生成的不溶性钙镁化合物,形成水垢,故A正确;B、可溶性物质随水的蒸发析出的晶体,遇水仍能溶解,不会形成水垢,故B错误;C、铝的表面有致密的氧化物保护膜,加热时不会...