单项选择题

The Dutch can hold the Eleven Cities Tour when ______.

A．the Gulf Stream influences the winter weather
B．winter is very severe
C．they are the host for the Olympics
D．half a million people take part
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单项选择题
When winters are cold enough, the Dutch go skating on ______.
A．avenues
B．Canals
C．airports
D．highways
单项选择题
Me-books' are helping children to learn ______.
A．reading effectively
B．writing beautifully
C．the adults' world
D．their home town's history
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