题干
—I will visit my grandparents in Beijing next month. Could you please tell me______?
—Oh, you may take the subway there.
A：where is the new airport
B：how I can get to the new airport
C：where will the new airport be
D：how can I get to the new airport
答案(点此获取答案解析）
B
的部分图象如图所示，则函数的一个表达式为( )．