发生霍乱时，对疫区内接触者，规定的隔离观察时间是
A．3天
B．5天
C．7天
D．10天
E．14天
参考答案：B
已知f(x)=x2-2017x+8052+|x2-2017x+8052|,则f(1)+f(2)+f(3)+…+f(2013)= .
It is always different being in a foreign country, __________if you don’t speak the language.
A．extremely
B．naturally
C．basically
D．especially
