单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Because it is much slower than the early one.
B．Because it often arrives earlier.
C．Because it is seldom on schedule.
D．Because it arrives in the middle of the night.
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D
问答题
The time that high tide occurs at a particular place is affected by the factors like the position of the moon, channels in the sea bottom and ______.
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