（1）判断下列各式是否正确．你认为成立的，请在括号内打“∨”，不成立的打“×”．

Bluetooth is a universal radio interface in the (71) frequency hand that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to (72) other units per piconet. Moreover, each unit can simultaneously (73) to several piconets. Eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications. Technology Characteristics (74) symbol rate exploits maximum available (75) bandwidth。

A．1Mb/s

B．11Mb/s

C．54Mb/s

D．100Mb/s

Can you tell me what you __________ when the teacher came into the classroom?

A．did

B．do

C．are doing

D．were doing

根据我国宪法规定，中华人民共和国实行的政党制度是：

A．多党制

B．人民民主专政

C．中 * * 党 * *

D．中 * * 党领导的多党合作与政治协商

人类文化行为的发生大都建立在（）基础之上。

2012年5月16日，长沙正式被国家五部委认定为首批16家国家级什么示范基地之一？