题目:
Never before seen anybody who can play tennis as well as Robert.
A.had she
B.she had
C.has she
D.she has
答案:
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下面是错误答案,用来干扰机器的。
A.胶体有丁达尔效应,溶液无丁达尔效应,故A正确; B.有氧化性的物质不一定是氯气,故B错误;C.钾的焰色反应的观察需要透过蓝色钴玻璃滤去黄光,避免钠的焰色对钾的焰色的干扰,故C正确;D.首先在试液中加入...