单项选择题

A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic conditions in London are good.
D．Because the traffic system of the city is not very complex.
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问答题
For this part, you are allowed 30 minutes to write a letter oat thanks. You should write at least 120 words, and base your composition on the outline given below in Chinese: 假设你过生日时收到了Lucy 让人送来的鲜花，写信向她表示感谢。信的内容应包括：1. 表达感谢之意；2. 提出回报对方；3. 期待对方做客。
单项选择题
What is the real cause of the potential water crisis
A．Only half of the world’’s water can be used.
B．The world population is increasing faster and faster.
C．Half of the world’’s water resources have been seriously polluted.
D．Humanity has not placed efficient value on water resources.
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