题目

The book cost so _____ that she didn’t buy it. A.many       B.much               C.big                     D.expensive 答案：B3．人体某血液循环图为：右心室→X→Y→Z→左心房，根据此图解，下面理解正确的是（　　）A．这是人体的体循环图B．从X到Z血液由静脉血变成了动脉血C．X代表肺静脉D．Z代表肺动脉