单项选择题

A．happened
B．occurring
C．going
D．taken place
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问答题
You are Linda, You and your friends were invited to spend Christmas day in your foreign teacher’s home. Write a letter of thanks to them, telling them how you enjoyed it.Marks will be awarded for content, organization, grammar and appropriateness.
单项选择题
This passage is concerned primarily with the ______.
A．problems of waste disposal
B．dangers of drinking from wells
C．turbidity of polluted water
D．outbreak of cholera
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