单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
What happened to the London underground railway about three decades ago

A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Its trains became computer-controlled.
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单项选择题
Which of the following is TRUE about Eclipse
A．It is a new kind of cigarette.
B．It won’t cause lung diseases.
C．It is the new brand name of a cigarette.
D．It won’t cause cancer.
单项选择题
What is the main topic of the conversation
A．The dances of a Native American dance troupe.
B．How Native American ceremonial dances are classified.
C．Variations of a basic dance among Native American tribe.
D．How Native American artists are trained.
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