题目内容
面与面的交线称为棱线
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棱线与棱线的交点称为顶点
绘制平面立体的投影，可归结为绘制它的所有多边形表面的投影或者绘制棱线和顶点的投影。
Which of the following words would be treated as minimal pairs?tap, pen, move, heat, tape, bun, fat, ban, chain, know, toe, tale, bell, far, meal, vote, heel, phase, face
Choose the sound which is different from the other two sounds in each group and point out the distinctive feature.1) /f, v, s/ 2) /p, f, b/3) /g, z, p /4) /k, g ,w/5) /m, n, l/
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