-- You see, it's my dream to buy __________ iPhone 6S.
-- Oh, you can ask your parents to buy __________for you.
A：a; it
B：an; it
C：a; one
D：an; one
皮肤通过分泌汗液带走体内部分水、无机盐和尿素等废物，同时也能带走一部分热量，调节体温．
计算（－212）×（－313）×（－1）的结果是（ ）
You are ___________ to type quickly when talking to each other on QQ so the other person doesn't get bored.
发挥社会主义制度优越性具有关键作用的经济成分是（ ）
