在诊断感染性心内膜炎时，下列哪项概念是错误的（）

A.可以有不发热的病例

B.脑栓塞罕见

C.可发生于先天性主动脉瓣二叶式畸形

D.高度二尖瓣狭窄很少发生本病

E.可以出现房室传导阻滞的表现

A client with type 1 (insulin-dependent) diabetes mellitus has just learned she’s pregnant. The nurse is teaching her about insulin requirements during pregnancy. Which guideline should the nurse provide（）

A. "Insulin requirements don’t change during pregnancy. Continue your current regimen. "

B. "Insulin requirements usually decrease during the last two trimesters. "

C. "Insulin requirements usually decrease during the first trimester. "

D. "Insulin requirements increase greatly during labor. "