题干
—Bill, what if your parents go out?
—They ask me to _______ myself.
A：look after
B：look up
C：look for
D：look through
答案(点此获取答案解析）
A
—Bill, what if your parents go out?
—They ask me to _______ myself.
A：look after
B：look up
C：look for
D：look through
Ca2+(aq)+2OH-(aq),下列叙述正确的是（ ）
