题目:
The charity sale our school organizes every year has taught us much. _______ we would never have learned it in class.
A.Therefore
B.Meanwhile
C.Otherwise
D.Instead
答案:
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( 10分)(1)物理性质:淡黄色粉末;相对密度为2.805;难溶于乙醇(任选其二即可)………………………………………………………………………………2分化学性质:在空气中吸收水分和二氧化碳的同时放出氧气;与...