-Many teens spend much time in front ofsmart phones computers an d TVs-They should cut down screen time．题目和参考答案——青夏教育精英家教网——

题目内容

10．-Many teens spend much time in front of（they）smart phones computers an d TVs
-They should cut down screen time．

分析 -许多青少年花费许多时间在智能手机和电脑及电视前．
-他们应该减少在屏幕前的时间．

解答答案：their．后面的smart phones computers and TVs都是名词，故前面用形容词性的物主代词来修饰，they是人称代词，形容词性的物主代词是their他们的，故答案是their．

点评形容词性物主代词是物主代词的一种（另一种为名词性物主代词），置于名词前，起修饰作用，表示某人的．
名词性物主代词=形容词性物主代词+名词

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