攀登和悬空高处作业人员，经过专业技术培训后就能够上岗，只要身体健康，无需定期进行体格检查（）
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The longest river in Canada is ________.
A. the Mackenzie
B. the St. Lawrence
C. teh Severn
D. the Yukon
Which of the following is not true about Canada's manufacturing today（）
A. Manufacturing is the most important economic activity in Canada.
B. Transportation equipment ranks as the nation's leading manufactured product.
C. Food processing is still important but it is no longer Canada's chief man ufacturing industry
D. The production of paper and paper related products is no longer important in Canada's manufacturing.
During the 1990s many Australians called for their nation to become a republic with ________.
A. a president replacing the British monarch as head of state
B. a prime minister replacing the governor--general as head of government
C. a governor-general replacing the British monarch as head of state
D. a president replacing the governor- general as head of government
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