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so it is often difficult to determine if the symptoms are a result of 2 to indoor air pollution.

A.

【参考答案】

【解析】选[C]。空前的0f表明此处应填一名词，且该名词应能与to配使用。首句中出现的experienceds......

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According to the speaker, why should people register early for the Business class?A．The class begins on September 1.B．There will be a $25 discount for the class.C．The enrollment is for only 30 people.D．A free textbook will be handed out.

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Part Ⅴ Writing (30 minutes) Directions:For this part,you are allowed thirty minutes to write a composition on the topic It Pays to Be Honest.You should write at least 120 words according to the outline given below in Chinese: 1.当前社会上存在着许多不诚实的现象 2.诚实利人利己，做人应该诚实It Pays to Be Honest

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