It seems everyone knows _______ me.[ ]
A. expect
B. except
C. beside
D. besides
答案:B
I’ve read many stories of Leifeng , this is the most touching one .
A.who
B.of which
C.of whom
D.that
人类的生产和生活都离不开金属.
(1)金属元素在自然界中分布很广,地壳中含量最多的金属元素是______;
(2)铁是应用最广泛的金属,铁制品非常容易锈蚀,写出用盐酸除铁锈的反应方程式______;请你提出一条防止铁制品锈蚀的方法______
(3)废旧电池中含有汞,随意丢弃会造成污染,威胁人类健康.汞的元素符号______,它不同于其他金属的一点物理性质是______.