As we all know, eating too much fat can ______ heart disease and cause high blood pressure.

A．add to

B．attend to

C．contribute to

D．apply to

插入肺动脉漂浮导管时最容易出现危险的是导管（）。

A.到达上腔静脉和右心房交界处时

B.到达右心房时

C.到达右心房和右心室交界处时

D.到达右心室时

E.到达肺动脉时