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Canada is officially bilingual both at the federal level and at the provincial level.（)

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4000－－－ fourty hundred.（)

Robert H Goddard is the founder of modern rocketry technology. He made the first liquid propellant rocket.（)

3个月以内婴儿高热时，病史询问的重点内容包括

A. 症状和体征
B. 疫苗接种史
C. 近期病原接触史
D. 母源感染
E. 早产

The teacher said that the Yellow river was the second largest river in China.（)