______ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal．

A．When

B．As

C．While

D．Before

高血压并发稳定型心绞痛的降压治疗的最佳方案是（）

A.β受体阻滞剂合ACEI

B.β受体阻滞剂合短效钙拮抗剂

C.β受体阻滞剂合利尿剂

D.β受体阻滞剂合长效钙拮抗剂

E.以上都不是