Which of the following operations belongs to message passing

A．read and write

B．save and receive

C．wait and signal

D．P and V

某小学老师考虑某学生学习成绩差与智力因素有关，打算给该学生作智力测验。该老师的主要目的是（）

A.做出心理诊断

B.教学研究

C.预测未来成就

D.计划医学干预