王叔叔购得三年期国库券4000元，年利率是4.18%，到期后可得利息多少元？
4000×4.18%×3=501.6（元），
答：到期后的利息是501.6元．
Tom, who is always shy in public, has made some friends at school, ______ has pleased his parents.
A．who
B．where
C．that
D．which
彩色多普勒血流成像的特点（）
A.用红蓝绿及混合色标志血流的方向和性质
B.用颜色的亮度标志血流的速度，速度越快越鲜亮
C.纯色表示层流
D.五彩镶嵌色表示湍流
E.血流朝向探头为蓝色
