A:2
B:﹣2
C:8
D:﹣8
— How many ________ were on the bus when the accident happened?
— About forty. Seven of them were kids.
在一个以肌肉为效应器的反射弧中,如果传出神经遭到损伤,而其它部分正常,当感受器受到刺激后将表现为