南宋和金议和，双方约定的界线是[ ]
A．黄河至海为界
B．淮水至大散关一线为界
C．划长江为界
D．以长城为界
答案：B
The two brothers are talented in maths, and both of them won the first prize of maths competition. [ ]
A. similarly
B. familiarly
C. frequently
D. correctly
中毒性痢疾多见于 （）
A.新生儿
B.婴幼儿
C.儿童
D.青年
E.成人
