--- Some of the plastic bags can’t ______ after June1.

--- Yes, people will use environmental bags instead.

A．use

B．be use

C．be used

D．are used

吸入纯氧能改善下列情况引起的缺氧状态，除外

A.不完全性上呼吸道阻塞 

B.肺炎 

C.急性肺水肿 

D.先心病右向左分流 

E.在高海拔地区进行肌肉活动