After gastric resection surgery, which of the following signs and symptoms would alert the nurse to the development of a leaking anastomosis

A. Pain, fever, and abdominal rigidity.
B. Diarrhea with fat in the stool.
C. Palpitations, pallor, and diaphoresis after eating.
D. Feelings of fullness and nausea after eatin

全班同学正在聚精会神地听老师讲课，突然有个同学不小心将书掉在地上，发出“啪”的一声响，这时同学们会不约而同地将视线转向发出声响的地方，这样的注意就是（）。

A.无意注意

B.有意注意

C.有意后注意

D.选择注意