单项选择题

A．National unity.
B．Cheap transportation.
C．The decline of Atlantic seaports.
D．Movement of the population.
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单项选择题
In today’’s world, anxiety can help motivate us, prepares us for things we have to face, and sometimes give us energy to take action when we need to.
A．Y
B．N
C．NG
单项选择题
Which of the following does NOT belong to the functions of memory
A．to store information
B．to retrieve information
C．to store data
D．to calculate data
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