题目:
(2013·高考福建卷)Not until he went through real hardship ________the love we have for our families is important.
A.had he realized
B.did he realize
C.he realized
D.he had realized
答案:
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(1)①②③(2)2Na+H2 2NaH(3)常温下钠与氧气、水反应,且钠的密度比煤油大题目分析:(1)物理性质是指不需通过化学变化就能表现出来的性质,包括色态味、溶点沸点、硬度密度及溶解性。本题中①②③为物理...