in his paper.he didn't notice his teacher coming．( )A．Having absorbedB．AbsorbedC．AbsorbingD．Being absorbed 题目和参考答案——青夏教育精英家教网——

题目内容

15．________ in his paper，he didn't notice his teacher coming．（　　）

A．

Having absorbed

B．

Absorbed

C．

Absorbing

D．

Being absorbed

分析他专心致志地在做试卷，没有注意到老师来了．

解答答案：B 句中有逗号分隔，没有连词，要用非谓语动词；be absorbed in专心致志，absorb与主语he构成动宾关系，要用表示被动的过去分词；句意表达的是客观事实，要用过去分词的简单式作原因状语．故选B．

点评过去分词是非谓语动词的一种，用法很灵活，分为简单式done（表示与谓语同时或几乎同时发生的动作）；完成式having been done（表示先于谓语的动作）．学习时，要把握其用法特征：表示被动和完成．同时还要注意区分现在分词和不定式．

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4．Yawning sends out certain messages-either"Oh，this movie is so boring"or"I probably need to get some sleep"．But did you know that a yawn can also help your brain to cool down when it is overheated？
A new study，led by a research team at Princeton University，has indicated that yawning could be the brain's natural way of regulating temperature．People yawn more often when the temperature outdoors is lower than their body temperature but are less likely to yawn when it is hotter outdoors，according to Sciencedaily．com．
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When people yawn，their jaw is also stretched，which increases blood flow and may also help cool the brain．
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A．to prove people yawn in winter and in summer equally
B．to indicate brain can regulate temperature naturally
C．to find the frequency of people's yawning
D．to show the real reason why people yawn
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A．longer outdoor summertime results in more yawns
B．yawning frequency changes with outdoor time
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D．longer outdoor wintertime leads to fewer yawns
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B．when the hot air breathed in makes the brain hotter
C．when the air temperature is higher than the body
D．when the air temperature is equal to the body
50．What could be the best title for the text？D
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B．Yawning Carries Some Information
C．Yawning Benefits Your Body
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