临沂市以“提升群众幸福指数”为宗旨，扎实有效、持续不断地开展了全国文明城市创建活动，得到了千万临沂人民的衷心拥护和积极参与，极大提升了城市的文明程度和文化品位，提升了临沂的城市形象。这表明，建设社会主义精神文明必须

①积极开展多种形式的精神文明创建活动

②充分调动人民群众参与精神文明建设的积极性

③坚持以人为本，人民群众共建共享

④以加强科学文化建设作为基础性工程

A．①②③

B．①②④

C．②③④

D．①③④

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 kb/s～512 kb/s in the reverse direction depending on the distance, 12000 or 18000 feet. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL .delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．FTTH

B．HFC

C．FTTC

D．HDSL