______words and expressions have come into the English language from American English.[ ]

A. A large amount of            

B. Masses of

C. A great deal of                

D. Many a

对于固定直径的精馏塔来说，塔板间距（），允许的空塔速度便越大。

A、越小

B、越大

C、适当减小

D、不变