题目内容

The reason she failed in the exam was______.

A. that she hadn't worked hard
B. because she hadn't worked hard
C. why she hadn't worked hard
D. because she was too careless

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A hinge joint is______ permits the forward and backward movement of a door.

A. what
B. that
C. which
D. where

起跑时重心在哪？

A. 重心在身体靠前
B. 重心在身体靠后
C. 重心在身体中间

起跑的蹬地方向在哪？

A. 向前推
B. 向后推
C. 侧前方

起跑的难点是？

A. 起跑时保持轮子与地面垂直
B. 起跑时保持两脚尖向前
C. 蹬地时轮子向后方蹬地