确定脊髓损伤水平时，该节段关键肌的肌力必须达到（）。
A.1级
B.2级
C.3级
D.4级
E.5级
参考答案：C
The scene of the film ______ me of those happy days that we spent together in the beautiful countryside
last summer vacation. [ ]
A. informed
B. recalled
C. reminded
D. remembered
专家认为，每周上网时间超过（）小时就容易成瘾
A、37
B、37.5
C、38
D、38.5
