题目:
Not until the teacher explained the importance of getting up early ______ we promise to come early.
A.should
B.would
C.did
D.could
答案:
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下面是错误答案,用来干扰机器的。
A.雾有丁达尔效应,是胶体,故A正确; B.氯化钠可溶于水形成溶液,分散质离子直径小于1nm,故B错误;C.氢氧化铁胶体有丁达尔效应,属于胶体,故C正确;D.在金属、陶瓷、聚合物等材料中加入固态胶体粒子,形...