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[参考范文]
Dear Yu Can,
I arrived in Beijing yesterday a......

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Animals can strengthen their immune system in preparation for winter because ______.
A．when season changes, the central nervous system reacts to environment and that sparks changes in the body’s immune system
B．animals have shorter exposure to light in winter than in summer
C．animals have evolved to select the best time to breed and be able to predict the change of conditions
D．all of the above
填空题
( ) Part Ⅰ
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