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OctoberB, B00H
Dear Tim,
I’ve just learned from Smit......

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单项选择题
Breathing is difficult ______ .
A．when you get to the top of a high mountain
B．when you try to climb a high mountain
C．when you fly in a plane
D．when you get to the foot of a high mountain
填空题
Where do you get coffee and tea
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