by the beauty of the countryside, the old couple decided to stay another week on the farm.

A．Being attracted

B．Attracted

C．To be attracted

D．Having attracted

支气管哮喘的主要临床表现是

A．吸气性呼吸困难伴“三凹征”

B．发作性呼吸困难伴窒息感

C．反复发作带哮鸣音的呼气性呼吸困难

D．带哮鸣音的混合性呼吸困难

E．呼吸困难伴哮鸣音