What is the main idea of this passage？
Advertisement．
B. The benefits of advertisement．
C. Advertisers perform. a useful service to communities．
D. The costs of advertisement．
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Which statement(说法)is true？
A. The west coast was a better place to make films．
B. There are no mountains near Hollywood．
C. People no longer went to the cinema after television became popular．
D. Hollywood began to make films for television after the First World War．
设某浮点数共12位。其中阶码含1位阶符共4位，以2为底，用初码表示；尾数含l位尾符共8位，用补码表示，规格化。则该浮点数所能表示的最大正数是()。
A. 27
B. 28
C. 28 -1
D. 27 -1
A．got roundB．joined inC．turned aroundD．showed off
A. got round
B. joined in
C. turned around
D. showed off
An air courier is a person who
A. manages a business company in foreign countries
B. organizes international flights for tourists
C. travels around the world with cheap tickets
D. delivers papers and packages to foreign countries
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