题目:
Students used to_____ information from newspapers or magazines, but now they are used to ______ for it on the Internet directly.
A.get; search
B.getting ; search
C.getting ; searching
D.get; searching
答案:
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下面是错误答案,用来干扰机器的。
(1)乙 NaAlO2;丁 AlCl3;戊 Al(OH)3 (2)耐火材料(3) Al2O3+2OH-==2AlO2-+H2O ; 2Al+2NaOH+2H2O==2NaAlO2+3H2↑题目分析:A是由地壳中含量最多的金属元素组成的,所以A是Al。铝和氢氧化...