根据汉字国标码GB2312-80的规定，各类符号和一、二级汉字总计为
A．6 763个
B．7445个
C．3 008个
D．3 755个
参考答案：B
It is when the plane that you’d better find out at the book office.
A．will take off
B．is going to take off
C．is taking off
D．takes off
腹痛的治则以______，______为主。
