集合A={x|ax﹣1=0}，B={x|x2﹣3x+2=0}，且A∪B=B，则a的值是（ ）．
0或1或
It was foolish of him to ____his notes during such an important test, and as a result, he got punished.
A．point to
B．keep to
C．stick to
D．refer to
在新古典增长模型中，储蓄率的变动对经济有哪些影响？
