关于正中神经返支的描述正确的是()

A．勾绕拇短展肌下份及其浅面行向上外方穿入拇短展肌深面

B．在屈肌支持带下份的桡侧由正中神经发出

C．支配拇收肌以外的鱼际肌

D．支配1、2蚓状肌

E．支配3、4蚓状肌

The poor boy seems _____ the news that his father died in the car accident for there is no sign of sorrow on his face.

A．not to be known

B．not to have received

C．to have not received

D．not to know