单项选择题

How were whales helpful to the Vikings

A．Their feeding ground could be used by the Vikings as a landmark.
B．They were a good source of food for the Vikings.
C．The Vikings could follow their migratory route to find the landmark.
D．They helped the Vikings find routes through the ice.
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单项选择题
When does the noise stop
A．At midnight.
B．In the morning.
C．When the car is turned off.
D．When the neighbors, son leaves for work.
单项选择题
16 Why didn’t the Vikings take the shortest route between Norway and Greenland
A．They followed the route of migrating birds instead.
B．They wanted to avoid pack-ice.
C．Along the longer route they could stop at islands.
D．They followed the path of the stars instead.
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