在修正中间画值钱要先分析原画和动画之间的流畅度，根据原画的设计揣摩中间画的错误。
参考答案：对
In the summer vacation we____ often take a walk along the river.
A might B could C would D should
12岁之后迁入饮水含氟量高的流行区，那他出现氟牙症的情况是
A．双侧上颌第二磨牙B．双侧下颌第二磨牙C．双侧上颌尖牙，双尖牙和第二磨牙D．双侧下颌尖牙，双尖牙和第二磨牙E．以上都不是
In the summer vacation we____ often take a walk along the river.