相同印刷条件下，圆网点的扩大关规律是50%的网点扩大值（）80%的网点扩大值。
A.大于
B.小于
C.等于
D.不一定
参考答案：A
下面各式是分解质因数吗？不是的打“×”．
9=3×3______
15=1×3×5______
5=2+3______
12=3×4______．
--- Would you like _______ swimming with me after school?
--- Sorry, I enjoy _______ chess with my father.
A．to go, playing
B．going, playing
C．to go, to play
D．going, to play
