在日常饮食中，强化碘最常用的食物载体是( )。
A．大米 B．果汁C．玉米片 D．食盐
参考答案：D
His doctor had advised him ___________ smoke, and later his mother made him ________ buying more cigarettes.
A．not to; stop
B．not to; to stop
C．to not; to stop
D．to not; stop
70%-80%的网络设备都来自于思科，同时几乎所有的（）都由思科掌握。
A.超级核心节点
B.移动网络节点
C.国际交换节点
D.国际汇聚节点
