交际运用。根据对话内容，在空白处填写适当的话语，使对话完整。

A:  I'm ready to do some volunteer work for our city.  I'd like to work outside.

B:  You could help pick'up 1._______beside the streets.

A:   I could do that! But what could my sister do? She wants to volunteer, but she 2._______like

      to work outside.

B:   3._______?

A:   She likes to play with children.

B:   She could visit sick children at the hospital.  She could play games with them.-,

A:   4._______!Now, how about my mom? What can she do?

B:   Does she want to volunteer today?

A:  Yes, she told me she'd like to help homeless people.

B:   She could collect some clothes and put them in boxes.  Or...she could 5._______ food at the

      food bank.

A:  I think she'd like to.

引起单纯右心衰竭的最常见的原因是

A．主动脉瓣狭窄
B．主动脉瓣关闭不全
C．肺源性心脏病
D．冠心病
E．右位心