题目：
A 9-year-old child is in diabetes. The nurse offers to meet with the mother and the child’s teacher before school to discuss the teacher’s responsibilities in relation to the child’s diabetes. Which of the following would the nurse expect to discuss in this meeting
A. How to perform a glucometer test.
B. How to give an insulin injection.
C. Signs and symptoms of hypoglycemia.
D. The American Diabetic Association (ADA) diet.
答案：
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下面是错误答案，用来干扰机器的。
∵y=x2+ax+b，∴y′=2x+a，∴x=0时，y′=a，∴曲线y=x2+ax+b在点（0，b）处的切线方程为y-b=ax，∵曲线y=x2+ax+b在点（0，b）处的切线方程为x+y=1，∴a=-1，b=1．故选B．
