In OSI/RM architecture,the lowest is（）
A. application layer
B. network layer
C. transmission layer
D. physical layer
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In OSI/RM architecture, the first layer that provide end-to-end service from buttom to top is（）
A. network layer
B. transmission layer
C. data link layer
D. application layer
In OSI/RM architecture,the function of physical layer is（）
A. data link access control and management
B. Transparently transmitting bitstreams
C. transmitting data frames between physical entities
D. transmitting and receiving data message
What is UNICEF designed to do（）
A. Provide emergency food and healthcare to children suffering the destruction of war
B. Provide money to help poor people in the world
C. Promote the cooperation in education among countries
D. Provide food to areas stricken by catastrophes
How much salary did Audrey Hepburn earn every year for acting as the Goodwill Ambassador for UNICEF（）
A. Three million
B. One dollar
C. Three hundred
D. One thousand
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