国债发行量的变化，不仅影响国民收入，而且影响居民所持有资产的变化，这就是()。
A．资产效应
B．需求效应
C．供给效应
D．经济效应
参考答案：A
已知抛物线y=x2﹣kx-8经过点P（2，-8），则k= _____，这条抛物线的顶点坐标是 ____。
According to the speaker, what happened in the U.S. in the 1940s around the time of the Second World War that affected the popularity of the regionalist art
A．The populations of small towns increased rapidly.
B．Art critics in cities began to take notice of regionalism.
C．Some regionalist painters began a new art movement.
D．Society became more internationally focused.
