哮喘治疗中哪项无助于提高β受体对平喘药的敏感性（）

A.纠正酸中毒

B.改善病人肺氧合

C.利尿剂

D.应用肾上腺皮质激素

E.控制感染

11. It is because people are likely to stay indoors ______ the virus can spread easily ______ people often catch colds.

A．and, that

B．so, that

C．therefore, so

D．that, that