题目内容

在OSI七层协议中，负责提供链接和路由选择并以分组或包为数据传送单位的是（）

A. 物理层
B. 数据链路层
C. 网络层
D. 传输层

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将中文词组译成英文：国内生产总值（全称）

The only sour note has been struck by new energy tax proposals in the US and the EC. （）

A. introductions
B. destinations
C. accommodations
D. suggestions

China is in a position to buy more and more technology and （）goods on the international market， and make greater contribution to the world’s economic interflow.

A. tofinish
B. finishing
C. finished
D. finish

What role （）playing in the new project？

A. theengineersare
B. aretheengineers
C. theengineersis
D. istheengineers