填空题

What fact may surprise you about dogs Dogs are ______

【参考答案】

colour-blind
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单项选择题
A．A heavy smoker.B．A weak smoker.C．A light smoker.D．A non-smoker.
A．A heavy smoker.
B．A weak smoker.
C．A light smoker.
D．A non-smoker.
填空题
Who sent a dog up in a man-made Earth satellite in 1957______scientists.
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