对前交叉韧带的描述，正确的是()
A．限制胫骨向前移动
B．伸膝时松弛
C．屈膝时紧张
D．起自股骨内侧髁的外侧面
E．以上都不是
参考答案：A
The sports meet, originally _____ this week, has to be put off because of the bad weather. [ ]
A. held
B. holding
C. having been held
D. to be held
神经系统结构和功能的基本单位是 。神经调节的基本方式是 。
