The longest river in Canada is ________.
A. the Mackenzie
B. the St. Lawrence
C. teh Severn
D. the Yukon
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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
泡沫灭火器适用于易燃液体，可燃气体和电气设备的初期火灾（）
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