回归热是指体温骤然上升至39℃或以上,持续数天后又骤然下降至正常水平,高热期与无热期各持续若干天后规律性交替一次
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听录音，横线上填上正确的单词。 A line 1 two points.
Lines can be short, and lines can be long.Lines can be 2, and lines can be curved.
When a line goes all the way around, it makes a 3 .
You can use a circle, three small circles and a 4 line to make a face.
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