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
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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
Hepburn gained instant Hollywood stardom for playing the Academy Award-winning lead role in___（）
A. War and Peace
B. My Fair Lady
C. Roman Holiday
D. Always
How to escape from “rip current”（）
A. It is a narrow, powerful current of water running perpendicular to the beach, out into the ocean
B. Swim sideways, parallel to the beach
C. Get you out of the narrow outward current
D. Wait until the current carries you past the sandbar
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