—Do you often exercise?

—Yes. I think exercising helps us ______. [ ]

A. keeping healthy

B. to keep health

C. keeping in good health

D. to keep in good health

下列有关重型系统性红斑狼疮病人治疗的原则哪一项是正确的（）

A.分为诱导缓解和巩固治疗

B.糖皮质激素是治疗的基础药

C.诱导缓解期需半年至一年才能达到缓解

D.诱导缓解期力求血清学、症状缓解和受损器官功能恢复

E.以上均正确