脑栓塞最常见的栓子来源于()

A．肺静脉血栓

B．颈动脉粥样硬化斑块

C．心脏栓子

D．脂肪栓塞

E．寄生虫卵

As we have known from the map of the woad, this is ______.

A．twice as large an island as that
B．twice as larger as that island
C．as twice as that one
D．twice as a large island as that