1.踢腿容易出现的错误动作主要有（ ）
A. 支撑腿屈膝
B. 踢腿屈膝、勾脚
C. 上体弓背或后仰
2
A. Because the products are in urgent need by their clients.
Because there is no liner scheduled in April.
C. Because the products will be shipped to another port.
D. Because April is the selling season for the products.
3
A. By the middle of March.
B. On March 19th.
C. The last week of March.
D. On March 25th.
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