Read and finish.（阅读上下文，补全对话）

John: Oh! School is over. 1._______

Wu: OK…But 2._______ now?

John: 3.______

Wu: Oh, It's time to go home.

John: Just a minute.

(They play together on theplayground.)

Wu: It's six twenty. 4.______.

John &Wu: Let's run!

A. what time is it

B. It's time for dinner.

C. Let's go to the playground.

D. It's 5:30.

肺心病时最常见的心脏改变是（）

A.左心房肥大

B.右心房肥大

C.右心室肥大

D.左心室肥大

E.左心房+左心室肥大