Mai began piano lessons when she was 8 years old. Each time she practised, she played more accurately and
made fewer mistakes. However, after two years, she lost interest and stopped her lessons. As an adult, Mai
decided to take piano lessons again and found that she learnt to play the pieces she had played as a child more
quickly than pieces she had never played before.
In terms of neural plasticity, Mai's increased accuracy as she practised as a child was likely a result of
A rehearsal.
B. relearning
C. long-term depression.
D. long-term potentiation.

apart from being against desegregation, governor of georgia eugene talmadge opposed as well to the work progress administration, an ambitious program of the "new deal" created by president franklin d. roosevelt to overcome the great depression after world war i. talmadge disagreed with welfare spending, job training and organized labor. according to his ideas, he thought the government was spending too much money on this, and he wasn't willing to accept a wage higher than georgia's lower average wage. besides, talmadge strongly opposed to the "new deal" as he thought it had communist ideas.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.