我国最东端、最北端所在省区是[ ]
A、黑龙江
B、内蒙古、黑龙江
C、黑龙江、辽宁
D、新疆、黑龙江
答案：A
学校
The computer system ________ suddenly while he was searching for information on the Internet.[ ]
A. broke down
B. broke out
C. broke up
D. broke in
