单项选择题

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
Where did the mine companies operate according to the news item

A．In 28 states, from West Virginia in the east to Montana in the west.
B．In 27 states, from West Virginia in the west to Montana in the east.
C．In 27 states, from West Virginia in the east to Montana in the west.
D．In 28 states, from West Virginia in the west to Montana in the east.
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单项选择题
What is unusual about the island of Martha’s Vineyard
A．It was settled more than 300 years ago.
B．Alexander Graham Bell visited there.
C．A large number of its residents were deaf.
D．Each family living there had many children.
单项选择题
What is the speaker mainly talking about
A．How animals survive harsh conditions in the wild.
B．How animals alter colors to match their surroundings.
C．How animals protect themselves against predators.
D．How animals learn to disguise themselves effectively.
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