同类有毒粉尘对人体的危害程度取决于粉尘的（）
A.溶解度
B.分散度
C.形状和硬度
D.比重
E.荷电性
参考答案：A
.Don’t be frightened by sharks as there is___________chance of being hit by lightning than being attacked by a shark.
A．as thirty times great as
B．as thirty times great
C．thirty times as great
D．thirty times greater
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