单项选择题

A．Art history.
B．Elementary education.
C．American literature.
D．Psychology.
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问答题
For this part, you are allowed thirty minutes to write an open letter to the major of the city based on the following situation:You should write at least 150 words, and base your composition on the outline given below:1．近年来，本市的空气污染情况越来越严重；2．你认为造成空气污染的主要污染源是哪些应该采取哪些措施3．呼吁所有市民积极行动起来，治理空气污染。
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