题目:
There is an urgent need ____qualified teachers in poor areas; in other words,poor areas are in great need____qualified teachers.
A.of;of
B.for;of
C.for;for
D.of;for
答案:
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答案:B题目分析:常见金属的活动性顺序表:,1、位于氢前面的金属能置换出盐酸、稀硫酸中的氢元素(不可用浓硫酸、硝酸),2、除去金属钾、钙、钠,3、Fe在参加置换反应时,生成+2价的亚铁盐,A、 银在金属活动...