问题详情

The sentence "Similar results were found. . . " (Last sentence, Para. 1) means ______.
A．the measurement of patient"s heart and lung function drops when without visitor
B．human volunteers only can"t provide help for the patient"s heart and lung function
C．patient"s heart and lung work more effectively when visited by dog and volunteer
D．none of the above此题为多项选择题。请帮忙给出正确答案和分析，谢谢！