题干
________ countries and areas have been seriously hit by the typhoon. Now people in the affected
areas are ______food and fresh water.
A：A number of; lacking i
B：The number of; lacking i
C：A number of; lacking of
D：The number of; lacking of
答案(点此获取答案解析）
A
2Fe3++2H2O = SO42- +2Fe2++4H
+；然后再加入K2Cr2O7溶液，发生反应：Cr2O72-+6Fe2++14 H+ ="2" Cr3++6Fe3++7H2O。下列判断正确的是（ ）
④加强政府调节，提高最低工资标准