题干
--Would you mind care of my dog while I'm traveling?
--
A：to take; Of course
B：taking; Certainly
C：to take; Certainly not
D：taking; Of course not
答案(点此获取答案解析）
D
Cr2O72—(橙红色)+ H2O中，溶液介于黄和橙红色之间，今欲增加溶液的橙红色，则要在溶液中加入 （ ）