ADSL的极限传送距离是（）。
A、100m
B、500m
C、5km
D、100km
参考答案：C
143. As is recorded in history, silkworms were first raised by a woman in ______ is today Hebei Province.
A．where
B．the place
C．what
D．Which
宪法对国家 * * 组织建构提出了哪些原则要求？
