单项选择题

In the past few years the school has _____ a lot of money improving the teaching equipment.

A．cost
B．paid
C．spent
D．taken
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单项选择题
Which of the following is NOT true about migratory bird’s flight
A．Some birds fly mainly by day.
B．Some birds fly mainly by night.
C．Birds like to fly during daylight hours.
D．Birds depend on the sun or stars to guide them.
单项选择题
Which of the following best expresses the main idea of the passage
A．Railroads grew rapidly between 1865 and 1900.
B．Railroads played an important role in American history.
C．Trains helped pioneers to cross the Rocky Mountains.
D．Trains controlled American economy in the 19th century.
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