-What's your favorite              ?

-Surmmer. Because I can swim in the river in summer.

A．subject

B．season

C．music

D．sport

轻度缺氧时神经系统的症状主要是

A．昏睡
B．谵妄
C．注意力不集中，智力减退，定向障碍
D．昏迷
E．烦躁不安，神志恍惚