— Is _____ true that Americans eat hamburgers and hot dogs every day?

— No, that's not true, but they are both very popular foods in America.[ ]

A. this

B. anything

C. it

D. something

以下不是引起慢性肺源性心脏病肺动脉高压的常见因素的是（）

A.缺氧

B.肺血管解剖结构改变

C.血容量增高

D.血液黏稠度增加

E.电解质紊乱