The different phones which can represent a phoneme in different phonetic environments are called the____of that phoneme

A phoneme is______.

A．a set of different realizations of a phone

B．a set of contrastive allophones in free variation

C．a set of phones in complementary distribution

D．a set of phonetically similar noncontrastive phones

A.phones

B.allophones

C.voices

D.phonemes

ice. To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device？（）

A.hub

B.router

C.switch

D.STP

E.subinterfaces

F.VLAN

to the same device. To ensure maximum throughout for the phone data sessions, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers and what technology should be implemented on this device？ (Choose two)

A. VLAN

B. Subinterface

C. STP

D. Hub

E. Switch

F. Router

G. Wireless Access Point

H. VTP

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．1.95GHz

B．2.45GHz

C．4.45GHz

D．11.45GHz

nd groups to make contact and communicate with each other over the Internet, usually with the objective of developing a personal, romantic, or sexual relationship.Online dating services usually provide matchmaking over the Internet, through the use of personal computers or cell phones.

Online dating services generally require a prospective member to provide personal information, before they can search the service provider’s database for other individuals using standards they set, such as age range, gender and location.Online dating sites use market metaphor to properly match people up.Most sites allow members to upload photos of themselves and browse the photos of others.Sites may offer additional services, such as webcasts, online chat, telephone chat, and message boards, Some sites provide free registration, but may offer services which require a monthly fee.Other sites depend on advertising for their revenue(收入 ).And some sites such as Badoo are free and then offer additional paid services in a freemium (免费增值) revenue model.

Many sites are broad-based, with members coming from a variety of backgrounds looking for different types of relationships.Other sites are more specific, based on the type of members.Interests, location, or relationship desired.

56.What is the aim of online dating system？

A、To strengthen contact between husbands and wives.

B、To provide matchmaking service to people.

C、To sell computers or cell phones to lovers.

D、To offer personalized sites to romantic people.

57.The word protective (Para.2) would most probably mean().

A、persistent

B、perspective

C、potential

D、particular

58.The author mentions that online dating sites can make money by the following means EXCEPT().

A、additional paid services

B、monthly fee

C、online advertising

D、registration fee

59.If you are not sure about what type of partner you would like to find, you’d better visit().

A、a broad-based dating site

B、a specific dating site

C、a site for a particular region

D、a site for people with the same desire

60.We can infer that the author’s intention in writing this article it to().

A、discourage people from dating online

B、introduce the online dating system

C、advertise some online dating sites

D、compare different online dating sites

A.by

B.at

C.for

D.on

E.in

Nokia (诺基亚) develops and manufactures mobile phones for the (demand)______ needs of China's telecommunications market.